Bruce's ending was deserved but IMO it would have felt more meaningful if he had actually died in the explosion. I still think Bruce running off to Italy with a woman he barely knows and has little reason to trust considering she stole from him twice and sold him out to Bane is a little far fetched, especially since he would undoubtedly be recognized at some point since he's a famous billionaire.
Having Bruce actually die negates the entire point of the movie. It's supposed to be about Bruce overcoming a death wish by learning to appreciate life again. You don't set that up just to kill him at the end anyways, It'd be deeply unsatisfying.
Selina also saved his life and helped him secure the bomb from Talia when she could have just escaped. That really should count for a lot.