I will give an alternate view. I've stayed 50 nights in my RV this last year in Maine, Hilton Head, Michigan, Colorado and various places in between. I think Class C's are becoming much more popular. My dealer can't keep them on the lot. A new one is not any more than a new diesel truck.
And the repairs are not as expensive. There's a big jump between most class a's ans c's in prices for new motorohomes except like the Thor ace which is close.
I see lots of C's at the higher end campgrounds flat towing a variety of vehicles. It's always fun to talk with those folks.
Definitely 5vers are very popular, Class A's and expensive Class A's are still the main Motorcoach but I do see Class c's on the roads a lot and maybe it's because I'm looking for them.