I'm glad for him. Will be fun and be a neat thing to have a hockey memory.
That said, I don't think this will boost him as a starting goalie. What is there, 10 games or so (I'm not overly familiar with the length of the SPengler Cup)? You often see backups get into 10 game stretchs in the NHL when the starter gets hurt, so this is really no different. Those stretches don't really transform anyones opinion of that goalie.
I agree with TG (as usual), Bernier is already a future NHL starter in most GM's eyes, this tournament won't change anyones opinion unless he plays absolutely brutal.