I was interpreting your post; happy to be corrected if you are not arguing that new owners could fix everything fairly quickly.
Funny you should mentioned the treble, as the dysfunction in the club really began in earnest in 1999 when the MMC blocked the Murdock-backed takeover, which wreaked havoc behind the scenes and created major rivalries across the club management. It lead to a power struggle with McManus and Magnier (and a few other stakeholders) which Ferguson capitalised on, gradually gaining more and more power beyond merely managing the playing and coaching staff. The Rock of Gibraltar affair was merely the final straw by then, and the resulting fallout allowed the dysfunction to grow, especially as Ferguson ultimately won out in that battle, as well.
As I have argued for many years now, I maintain that most of the state of that club is in now can be traced back to Ferguson’s hubris, selfishness, and ineptitude in business, especially after the treble.
It all didn’t just start when the Glazers took over.