Fergie was close and that wasn't a strong United team. Also, they won the league last year and complacency and sometimes kick in. They lost on goal difference and City didn't run away with the league.
As for the business part...countries are on the verge of bankruptcy becaue of a few greedy individuals. Business isn't really the word. Money and greed is probably more accurate. It was always going to spiral out of control if left unregulated and that's what we're seeing now.
Sure but this summer Citeh can throw more darts at the wall except this time, knowing what team they can play, as their default option, much like Chelsea. They now know, it works. Like you say about countries, the only way it's really going to fail is through self-implosion but I don't think they'll make the same mistakes Chelsea did.
It's going to be incredibly difficult to overturn them now. Man Utd have got through this season through sheer force of will but even at 89 points that wasn't enough.
With the amount of egos Mandini has to manage and keep in check...it won't last. They won't dominate every year. They'll be a strong side but complacency will kick in, jealousy, competition for places...that will take it's toll on them and they won't be at their best. Soon enough, they will have to rebuild their squad and that's where the most together and stable clubs step in to take advantage. That's where we have screwed up. Two or three seasons ago, Man Utd, Liverpool and Chelsea were all unstable because they had major players leaving and new managers settling in. We never took advantage of that period even though our squad was the most stable.