What they need to do is ban those extremely rattlely diesel pickup trucks that haul 5th wheelers that take an hour to park and get situated.
I suspect they haven't caught up to Class B technology with second alternators and such but are probably aimed at those diesel pickups and diesel Class As as the catalyst for banning running engines. Those RVs in a mixed use RV/tent campground are kind of like bulls in a China shop. They are much louder than Sprinters.
Given what I planned for my upcoming B, my camping habits and the fact I seldom ever ran my Onan generator on my current B, I don't envision ever needing to run my engine in a campground to charge batteries. In a B it doesn't take much to plan ahead and if you really, really need to, just drive out and go check some scenery somewhere or drive into town for some groceries and supplies.