Decline is the new norm for churches.  Difference is rate of acceleration.
RCs ought to check out Quebec Province whose decline dramatically accelerated in the 60's. Many parish churches seemed like cathedrals.  Gone with the wind of lack of interest.
B16's smaller church is the future.
"Yet a time is coming and has now come when the true worshipers will worship the Father in the Spirit and in truth, for they are the kind of worshipers the Father seeks."
"...And has now come..." John 4:23
Decline is all the work of the Spirit?