Priest shortage is root cause
The Church is doing well in the RC heartland of Bavaria
While the priest shortage is an issue, I see the same dynamic at work here in the northeastern US where a cluster of 5-10 parishes has the same number of baptisms, weddings, and funerals as one parish had 50 years ago. The 96% closure might just be caused by a previous bishop refusing to officially close parishes that had in fact become empty museums anyway.