I guess a lot has to do with where you plan to camp and when. If you are planning to camp during the summers and on weekends, then yes, there are more RVs. If you plan to go to touristy places on weekends and during school holidays, yes, there are more RVs.
If you plan to camp in the spring, fall and winter, there are still plenty of sites available. You will most likely need to make reservations if you plan to go to those touristy spots, even during the off-season.
We also camp-host and there are more younger families camping both in tents and with RVs. It's great to see them enjoying time with their kids. That's one of the reasons we continue - our kids really love it, even though they get busier each year.