The teams that went for it and failed didn't have the necessary cash. Chelsea and City went for it and succeeded because they have, and continue to have, the necessary cash. For a while Blackburn, a smaller club than us most would agree, had the cash and succeeded. then the cash disappeared and so did they.
Cash is king, the Prem is capitalism writ large. The teams with the most cash win most prizes, it's very simple.
The only way to break the Utd/Pool/Woolwich cartel is through stacks of cash. City and Chelsea have done it that way. Until we get rid of ENIC or they change their ways we'll be looking in from the outside, with a very occasional trophy or CL outing to keep us (un)happy.
Money talks, loads of money talks louder.
I don't care who we get as manager, while we've got ENIC and our present stadium we won't win the Prem or CL. Even a new stadium is unlikely to do the trick if ENIC drain off a major part of the income to pay for building it.
Personally, I'd rather be part of a football club, which pays its bills using our gate receipts, TV money (which comes from people who want to watch that club), merchandise etc. I'd hate for Tottenham Hotspur to be the plaything of a billionaire – especially one that's become a billionaire by accident of birth or murky (at best) business practises. Even if we were at the bottom of the conference, I'd prefer it to being whored.