Young Avengers, as a comics title, apparently has quite a passionate (if perhaps somewhat niche; I don't think it's ever been a great seller) fanbase, but I don't think the mass moviegoing audience is ready to see a team of teenage replacements take over for the adults, especially when plenty of those adults still do have cinematic mileage in the tank (and new adult hero franchises are going to be kicking-off, too). It doesn't really sound like my thing, either, but I was no longer actively reading new comics by the time they really showed up, either.
Makes sense as a potential Disney+ show, though.