That’s a really good point about domestic travel. I’d thought of all the other reasons you listed for why it’s so popular right now, but for some reason this last point hasn’t occurred to me.
it will definitely be interesting to see what happens in a few years and I think we’ll see at least a bit of a leveling in demand. I do think that Disney just continues to grow in popularity. Even before all this it had become “there’s no slow time at Disney World anymore.” My generation grew up during the Disney renaissance when Disney was insanely popular. Disney was of course popular with generations before, I just think it’s super popular with adults in the millennial/gen Z generations and more accepted that it’s not just for kids among us. I tend to find the “Disney is for kids” comments I get when I talk about going on Disney trips always come from the older age groups. I don’t want to offend anyone! I of course know there’s lots of avid Disney fans of all ages, that’s just been my personal experience. My in-laws I know find my Disney fandom (and I’m sure the fact that we got married at Disney World) ridiculous.
As for the nickel and diming, I wonder if newer guests even realize what all was included before? Most of the time when I help coworkers and friends with trips, they have zero clue about any of the benefits/programs (like old fast pass), so maybe new guests won’t really know any better to be dissatisfied with paying for thing like
Genie+ and IAS

Or about magical express, etc.