As others have said this is a pretty wacky conspiracy theory, but at least you called it what it was. The idea that Hasbro, of all people, were so peeved by the OGL that they were doing stuff like asking for a revised setting or rules seems pretty far-fetched, to put it mildly. That there was some suggestion that the OGL had to go though seems a lot more plausible. Everything else is better explained without resort to conspiracies. Plus, there's just no way someone who used to work there at the time wouldn't have mentioned this by now, given how much 4E was discussed.
WotC has already tried this though. Multiple times in 3E. They both had the close-to-D&D Star Wars, and d20 Modern.
The D&D chassis, and 5E is arguably worse for this than 3E or 4E, is just not good for many (if any) other genres or styles of RPG. We've seen this over and over again. Even if you went relatively narrow and made a game specifically that was less-difficult to fit to that chassis (probably planetary romance or something similar, which is not a popular genre in 2021), it's hard to see how that would make D&D more successful, rather than merely causing some small fraction of D&D's existing audience to swap to the new game.
If WotC make another pen and paper RPG, I'd expect two things from it:
1) It'd probably be Mass Effect-adjacent science fiction - i.e. science fiction but towards the more psychic powers and anti-grav exist kind of end of the scale. This very broad genre is both popular with and accessible to a large audience (including some who don't like fantasy much). They'd likely have some random concession to hard SF to make those people who love to go on about how they love hard SF and then reveal that they're massive Expanse fans (which left the realms of "hard SF" before the end of the first book/season, let alone later ones) keen on it (if I had to guess, it would be some kind of attempt to not have anti-grav despite having inertial dampers or something).
2) It'll use an entirely different system to D&D, but one very much learning from what works with 5E and other modern RPGs. I'd also expect it to be medium crunch and with significant narrative elements. By using a different system they can potentially sell even more stuff, and appeal to an audience who might not love D&D's "Levels and HP" approach (and it's those two elements which mess with D&D's ability to do most genres). I also expect they'll look at how D&D encourages longer-term engagement than some TT RPGs with the particular way levels, magic items and so on work. I don't think they'll replicate it exactly, but I'd expect a low-granularity advancement system and items/equipment that changed how characters worked and so on.
Archetype Entertainment are WotC's ex-Bioware guys (including the lead writer of ME1 and co-lead on 2) and whilst their primary goal seems to be to make a CRPG (and given they have like 28 people, that's likely 3-5 years away), I'd unsurprised if the setting, lore and perhaps most importantly art were used to also create a TT RPG based on it.