The problem with all those beautiful wonderful old churches is upkeep. One in my neighborhood that is truly wonderful is literally falling apart and will cost millions of dollars to fix. No one has the money. I am afraid of what will happen to it and the bishop already tried unsuccessfully to close it once. I am praying for a miracle to save it.
If one of these pretty, but less fabulous, churches has to be torn down or sold, it will be sad for the parishioners maybe, but not a huge architectural loss.
I frankly would rather not see churches built unless people are committed to keeping them forever, but I know that is unrealistic. I like to think when they are destroyed on earth, they are rebuilt even better in Heaven, so people can enjoy them there.