By now, it should be universally accepted that no one can know precisely when churches will be permitted to reopen their doors to groups of more than 10 people.  Critics may criticize for any number of reasons, but this should not be one of them.  Also, even with the uniqueness of the COVID-19 situation, any time we deal with uncertainty on this scale, we do well to prepare for as many different scenarios as possible.  That said, I am grateful for the work others have done to forecast trends and ideas of where the Church may be post-coronavirus.  Having done some of my own research, I'd like to add a few thoughts for church leaders to consider.
The 80% rule (or 70% rule) will probably become the 50% rule (not the 60% rule).  You understand your worship space feels full at about 70-80% capacity.  Some predict that post-coronavirus this percentage will fall to 60%. Based on researching policies at AMC Theaters and Regal Cinemas and others, 50% appears more likely.  This has implications for churches who are designing buildings.  If we build what we had previously designed, we will basically lose 60 usable seats if 50% is the new normal.  It also has implications for mobile churches.  Depending on how your rental agreements are structured, you may have to rent more ballrooms, or more classrooms, and this could drive up your costs.
"Public Health Officials" hold the trigger.  Not much is said about how we will know when we can resume gatherings, probably because we are at the mercy of the government.  The NBA, NHL, and other entities identify "public health officials" as having sole authority about when things reopen.  For churches, this is significant, because we appear to have mixed feelings as to our level of willingness to comply with what these officials hand down.  Let us factor in the reality that these officials are not just cancelling public worship, but also any gathering of any real size.  This is a good talking point for conversations with members.  It is essentially out of our hands.  
People will give toward this but not that.  Some are postulating how giving will be affected by COVID-19, just in broad terms of how much it will decrease.  Admitting that none of us know anything about the future here for sure, it feels that giving could hold steady, decrease less than expected, or even increase depending on priorities.  Layoffs, reduced hours, and basically having less residual income will change things.  It feels like people will likely prioritize ministry (difference-making) with immediate fruit, community involvement, personnel (who are making a difference, loving, and serving), missions, and technology over brick-and-mortar, utilities, property upkeep, and so on.  This will have budgeting implications.
I will save my other thoughts on future trends for a later post.  Hope this helps!  If you have a sense of where things are going for churches after COVID-19, please feel free to share it in the comments.
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One gift Sir Isaac Newton gave the world was his Law of Inertia (sometimes called Newton's First Law or Law of Motion) - namely that objects at rest tend to stay at rest and objects in motion tend to stay in motion (unless acted upon by an unbalanced force).  
When it comes to church attendance, it was challenging to get people to come to church before the Coronavirus disease.  Our church would have 63% of its "active members" in public worship any given week; but it was a different 63% every week.  We found that the national trend of people attending 1-2 times per month was true in our church.  That was before the virus.  Now that we have been unable to gather for two consecutive Sundays, anticipating at least a third, what will that mean for us coming back together?
As church leaders, we need to be prepared to lead from the expectation that Newton's Law of Inertia applies here.  If we do not initiate an outside force acting upon our people, then those who are no longer in motion (i.e. they no longer attend) will continue not being in motion, even after we are cleared to resume public gatherings. 
What should that "outside force" be? Here are some ideas.

• Homecoming 2.0  I am hoping that the way this resolves will give us some time to put a date on the calendar, prepare ahead, and drive a stake in the ground that on this day, at this time, we will relaunch public worship.  I can see using imagery such as reigniting a flame and avoiding language such as resume business as usual.  Let's not squander the opportunity for freshness, and let us welcome a new normal.
• Personal touch  Throughout the quarantine, my Assistant Pastor and I are calling members at least once per week to keep us on their minds and assure them that they are on ours.  A campaign to recruit and invite people as if you are chartering your church for the first time might be what is needed.  I can see a social media campaign complete with signups either on your website or another method where people commit in advance something along the lines of "I'll be there."
• Awards ceremony Our church has been doing something we called the Purpose Driven Quarantine Challenge.  We have emphasized this significantly, and I hope that we have several dozen people who earn prizes to be given out.  

Some say that this COVID-19 outbreak will separate the truly committed from the pretenders.  As someone who has seen God transform pretenders into the truly committed, I do think such predictions may come true to a degree.  However, I can also see that God may grow His church even in such an unlikely circumstance.  We are working on ways to get those we have picked up through social media during this dispersion.  Wouldn't it be something to find out that we increased our congregation by 20-30% just by going online for a month or two?  I'm not aware of a single church growth resource that ever recommended that strategy.  However, sometimes the Lord just has to force us to cast that net on the other side of the boat.  
I will pray for you and your church as you put together intentional plans for coming back together.  If you come across an idea for keeping everyone together that seems helpful, please put it in the comments below.