If an old gypsy woman got out her crystal ball today and told me that Rafa wouldn't win the league within the next three seasons, I still would not hesitate to keep him around for the next ten years at least.
(Disclaimer: not hoping that's the case by a long shot, merely pointing out that the task was a formidable one; no doubt I'll catch a bit of flak for this, but continuity is an important element of longterm success.)
If we look at the kind of bite we've added to the squad since he's been around, and we look at the type of football we're starting to play, it's easy to feel hopeful. With Rafa, each year has been progressively sharper than the last, and I'm certain that Rafa's got it in him to win it all.
The Mancs and Chavs have considerable resources, however, they're also woefully wasteful, and even with the ownership difficulties, we're not that far behind them. Arsenal look to be having a make or break summer, so we'll see what they look like once the season starts again, but they don't look to have as much steel to them as the run to the top of the table demands.
While Tottenham look to be on the right track, I think it must be said they're not up to par yet. The Shite will always be the Shite. Therefore, let us take heart regardless of which Swiss RB's we're linked with (and who knows, maybe Rafa can get something out of him after all).
We're not far off, and we don't even need David Villa to do it--though certainly I wouldn't turn him away if he showed up on the doorstep. I'm looking forward to next season.