OK, been part time RVing for 19 years and now have been to 190 different RV parks in 11 western states and two western provinces. I am not a knowitall (just ask my wife) but we have been a lot of change.
Yes, more rigs for sure from baby boomers but another factor is the rentals - my God, the rental units! Mostly class C and mostly people from Europe.
Which is why we reserve spots way ahead with a lot of trip planning. Do we make changes? Not often but we do - and when we do we reserve at the place we are changing to.
We prefer to be at a place enjoying it rather than spending time looking for a place who might or might not have space.
Just our observations / comments.