But to suggest it's entirely on coaching/support is a little disengenuous. IMO, it IS up to the player. You can provide the BEST coaching/support the NFL has to offer, but without the player absorbing/implementing that support, the result is the same.
The thing is, if you don't use the coaching/support as a universal excuse for QB failure, you also have to confront the fact regarding a QB who has failed.
And that's unpalatable for someone who needs to keep making excuses for their favourite player. On the discussion boards of every team he plays for, no less. Those lucky East Rutherford folks are next...