2 is not logical, and does not follow. Again, Pokémon, Power Rangers and Teenage Mutant Ninja Turtles. Still popular 30 years later with the next generation in my experience.
And only because they have very dramatically changed. In ways that, believe it or not, significantly upset many of the older fans, while leaving the new ones blissfully ignorant.
We keep going around this circle. You are acting as though nothing whatsoever has changed about properties that are 30-50 years old, and that's obviously ridiculous. Unless and until you recognize that D&D
will have to change, in some ways, whatever they may be, in order to keep up with the new demographics, there's nothing further to be said.
Consider, for example, a smaller microcosm: MMOs. MMOs haven't been around nearly as long as D&D has (no surprise there, D&D inspired most of them.) Yet the field has already seen major changes. Take someone who's a big fan of FFXIV or WoW or GW2 and have them go play Ultima Online or an original, unpatched, day-1-release version of EverQuest. They'd
hate it. And we can say this with confidence, because we've seen it happen with literal actual live games. Blizzard released WoW Classic--and it did decent! It wasn't as big a phenomenon as mainline WoW, but it brought people in, to be sure. It also had
mountains of bug reports...about things that were intentionally included in order to be maximally faithful to the "vanilla" WoW experience. WoW Classic was a "warts and all" remake, and people genuinely weren't as enthused about it as they thought they would be, even though many of them had actually played "vanilla" WoW on release!
Point being, your ironclad confidence that
absolutely nothing whatever has changed about gamer preferences in the past decade, to say nothing of the past 40 years, is completely misplaced. Some things will, most assuredly, remain the same. Other things will change. Neither you nor I have any idea which specific things they'll be. But we can be absolutely certain that, whatever the different preferences of the new blood,
those will be what WotC chases. Because yes, preferences really can shift even within the original founding population--if you're legitimately looking at a
new population, it would be ludicrous to the extreme to suggest that no meaningful changes will occur.