You're living in the past. It's very possible that the tradition resumes in the near-future, especially with Greenwood and McT, but it's not really something I would rely on at the moment, especially with the coaching, or lack thereof, the team seems to be getting.
Letting Pogba go would be just another step in the downward spiral this club has been in for over half a decade now. The club just isn't attractive anymore for the best players, we're talking about United, a club that players would kill to play for in the past. You think Haaland goes to Dortmund over United 10 years ago? No way. It's only going to get harder to get top players, so if fans are okay with that then let go of Pogba and become a midtable club that's relying on development to get back to the top, but there's so much more to do than just selling Pogba and getting a few pieces back to make that transition. You need actual good coaching.