English football should be grateful
United is such a commercial machine that had Glazer not burdened them with debt and run them like brick (they have matched/outspent City even with the debt), they could easily have dominated the last decade of PL.
They are fudged now, the debt plus time and money required to update their infrastructure, squad and really compete is massive, if they got all decisions right (something they seem incapable of doing)
No it shouldn't. Exciting football. Drama. Marketing. English language and time zones. That's what made the premier league.
You don't want a team to dominate too much. It becomes boring.