Well I agree players make an average coach look good (see B. Hoke) ... but good coaches make players and the team better (see Harbaugh).
You named Luck, but name a guy on Stanford's defense .... well, Harbaugh and the DC made that defense. It's probably 2 and 3 star players, but they have been coached up and they are nasty.
As to the bright future, after 3 years we had 1) a good offense 2) a pathetic defense (worse ever) and 3) less than average special teams. So of the 3 "areas" of football only 1 has improved since RR came in 2008. IMO the other 2 facets were worse in 2010 than in 2008 ... and that's not progress.
Go Blue !