This is pretty much a perception issue along with a change in demographics. Along with those, we could add in the generational shift and the advent of Vensa mentality, mentioned previously (good example, BTW).
I don't see that the current generation has anything "tougher" unless equating less disposable income as "tougher". For the last 100 years, people in North America have worked less and comfort has increased, in general terms.
RV sales are rising and it can't all be retired folks. If you reference it to population growth, I bet it would parallel so the percentage of people that own RV's is probably close to past generations.
There is probably a generational shift away from camping as a recreational activity just like there is generational shift away from using tools or towards extracurricular activities in school age children. These types of shifts are motivated by lifestyle choice and circumstance more than as to parenting morals. If you grew up around tool users, chances are greater that you would adapt similarly. If your personal time is shrinking and you have school age children, sports tends to fill that gap.
Times change and people along with it. If you're not swept up in that river of change but are looking at it from the bank, the perception is that the river is different, not so for the people in it.