These churches will turn into volunteer organizations that have no need to cover payroll taxes, have minimal overhead expenses, and rid themselves of all the burdens associated with being a well-financed arm of the government as many of them are these days.
In other words, churches will go back to being what they always should have been: religious organizations.
The “house church” is also likely to come back, which was a common New Testament phenomenon.
Losing the “audience/stage” vibe will probably add to the mutual communion sense of worship gatherings.
The church is one organization that fares better under pressure. If you want to make a church weak, make it too easy for that church.
In other words, churches will go back to being what they always should have been: religious organizations.
That’s all fine and dandy, as long as you’re ok with them divesting their schools, hospitals, and other charitable organizations...