It's really sad, have thought about it quite a lot and don't see a single solution that doesn't involve us falling possibly to a level we can't claw back from given how we've lost our competitive advantage.
The way I see it is that there are 3 possibilities:
1. The Glazers are incentivised to invest in the team, the stadium and so on. For this to be the case, there needs to be a positive return to that investment. From their point of view, they are paid a dividend every year, which is just about guaranteed. The less they spend on transfers, the more solid their dividend is. So cash flow wise, it's a tough one. The only other way is to increase the value of the club - but that only helps if they plan to sell it.
2. The Glazers are exited in the short term - <2 years. This is the optimal solution. We keep most of the playing staff, coaching staff, brand and prestige, but through some miracle get new owners who care about the club. But I see no way it happens.
3. The Glazers bleed us dry for another decade, relying on increasing tv rights to maintain their dividends, and finally leave after selling us in a fire sale once we're in the second division and have no decent players. We fall so far behind our rivals that even wealthy new owners can't afford to invest the type of initial outlay (even if they could break FFP...like City) required to return us to where we once were. We become mediocre, perpetually.
It really is that simple, and everything I've seen from the Glazers suggests that we'll see option 3.