schneeland
Hero
Hacking AD&D is luckily an endeavour I never tried to undertakeOf course there's also far less incentive for the current cohort to find radically different systems than there was back in the ancient times when we had to dodge the dinosaurs to roll our d20s. The core of 5e is very hackable and also very solid - it's actually fairly easy for an individual DM to twist it into the shape of the game they want to play so long as their players are willing to go along with the reskinning of the game and the game they want to play is "something like D&D but in a different genre." Unlike AD&D where you could do it but oof, it was easier to just go find a game that would do what you wanted than to try to run a Star Wars game with it.

For me personally, "D&D in a different genre" no longer holds the necessary appeal, and if that was the only option to play, I would probably have exited the hobby when our last big 3.5 campaign died in 2015. But I'm also 20 years older (and probably a lot grumpier) than the people who entered it with 5e. So we'll have to see if they reach the same point of being jaded about D&D and feeling the need to branch out.
*I really wish, 5e lived up to the playtest idea of modularity, but I guess that ship has sailed.