The problem is that in many parishes, up to half of the congregation is there for the millwork and stained glass. They don't have any theology to speak of, and don't really care what is being said in the pulpit, so long as it doesn't run too long.
In many cases, you will end up with a healthier church if you walk away from the buildings and the pew warmers.
I can’t argue too much with walking away from the buildings and pews, except for the principle involved.
They or their ancestors built, paid for, maintained, and worshipped in those facilities for years. They are places with memories of family, weddings, funerals, baptisms, and celebrations.
In reality, they belong to the local body.
But, for those who can follow your advice, then do so.
“While they are still in “good standing” with the ECUSA, they could enter building programs in which they totally sell off old buildings, and enter into expensive mortgages on new facilities”
The church that I represent cares more for the continuing ministries than for the building. They can continue in a “Grange” hall or school on weekends since their ministries are carried out in homes and workplace. They also do not want to borrow under false pretenses just to pass on a huge debt. Their testimony is important in the community they minister to.