I don't think the changes coming in 2024 will be significant enough to overcome the the psion problem, which largely stems from 1st, 2nd and 3rd editions all doing it very differently, and all the psion fans insisting that their version is the one true version.
I don't think that's a real problem given like, maybe 70-80% of 5E's
current playerbase never actually played 2/3/4E, and even of those who did, probably less than 50% of those who did play older editions have a "strong and fixed" opinion on psionics (maybe a lot less than 50% - like it could be 20% and 20% of 20% is not many players).
I think you're confusing an "ENworld problem" with a "D&D problem". We're a bunch of grumpy old grogs, for the most part. Most D&D players are much younger than us, and 5E is their first TT RPG. This was admittedly
not true when they first tried to bring psionics, because back then they had what, 10m players? Most of them D&D/PF players. Now we have well over 50m (god knows, it might be past 60m by this point), and they're not at all the same people who sneered and snarked at the Mystic (which was actually not bad) and thus derailed psionics getting into 5E.
So yeah that problem is gone.
That doesn't mean it's certain, or that there might not be some other problem, but that specific problem got swamped out of existence. Especially as on the places where older and newer players meet (like reddit), older players are absolutely NOT respected for their opinions lol. Not even slightly! God help you if you admit to enjoying rolling stats. A clearly intelligent and articulate but utterly fanatical 20-something will explain to you that you're not only wrong, you're bad for D&D, and possibly even actively a bad human being for encouraging rolling stats, and he'll get 500+ upvotes whilst you get maybe just enough upvotes to stay neutral, if you're lucky lol.
(The funny thing is I don't even like rolling stats, but jesus I've seen what happens to people who do... Also that's not a metaphor or analogy - I am
literally talking about rolling stats.)