Better coaching? For certain...
Nick Saban is the gold standard of collegiate football coaching. Some, such as Bob Stoops, Urban Meyer, etc., can come close, but there's no question that Nick Saban is the best out there.
Better assistants? That's up for debate.
He knows who to hire to get both quick and fast short term results, as well as the long term picture, and with a well-oiled machine already in place, these assistant coaches can certainly thrive. They don't have to try to re-invent the wheel, simply because what is already there seems to work quite well.
That being said, I think we have some pretty good assistant coaches of our own. We certainly made some upgrades last year, especially when it came to the DC, S&C and ST (somewhat).
Better talent? Arguably, yes. Not only do the best players in the land want to play for the best coach in the land, but with few restrictions in place, Nick Saban can pretty much get who he wants most of the time.
He has total control over the football program, which is something the Notre Dame Board of Trustees will NEVER ceded to any coach.
Now, that being said, given the talent level we have at Notre Dame, it should be more than good enough to produce consistently good results, using a 10 win season as a standard.