Admittedly, he's never really been one for longevity, but he's never really had that chance in his managerial career. He could only go so far at Porto, he was gotten rid of by Chelsea, the media effectively forced him out at Inter, and no manager can survive for a long time at Real Madrid.
You're acting as if Mourinho deploys boring, defensive football, which is one of the biggest myths in world football. Look at his Real Madrid side, how many goals they've scored, and tell me honestly that they're boring. The fact is they're not. He'll sometimes be more cautious in the big games, but he generally wins them, except against Barca.
I could see him giving some of the youngsters a chance. Again, looking at where he's been, he's not had much of a chance to do that, in all honesty. He's generally been at clubs where there hasn't been too much youth, and it's been easier to just go out and spend. With our financial constraints, he won't really be able to do that anymore.