We had this same debate with ourselves before we left on a CC camping trip. Florida to Cape Cod, to Seattle, to N CA, to Nevada, to Utah, and still on the road since May. We're aiming back to Florida now, probably take a month more.
Despite the shutdown on NPs (which usually have no power anyway) we've made it without a generator. We have ONE on board battery. many state parks have FHU or at least W/P. So, every few days, or once a week, we find a state park or a COE with power, and top charge everything - TC battery, LT, camera batteries, etc.
We decided when we left to see what happens, and that if we TRULY NEEDED it, we'd just buy the Honda or Yamaha when we 'had to have it'. SO far, we have not bought one ...
We have no television, hair dryer, etc, and we use battery in a very conservative fashion, but even if we had a generator, we'd still keep up the same lifestyle... So far, we've never felt inconvenienced enough to buy one.
BTW: Nothing upsets me more than sitting at my campsite and having the neighbors fire up the noise and run it for hours at a time - especially in the evening hours. IF YOU SIMPLY MUST run it, do the courtesy of running in the daylight hours when we're off enjoying the area.