Eh, I don't mind the trash talk so much. Frankly, a few of Nick's barbs towards GSP at the post-fight press conference made me laugh. And I've always been a fan of his and Nate's 'style' both in and out of the cage. I'd just like to see him take a few other big fights at UFC rather than go this sad route. I still see Nick as a top WW fighter, and I'd much rather see him put his stamp on the UFC WW division than take a couple of losses, complain, and then retire. I don't mind this little schtick, but I'd hate to see him retire off of it.
Whether he's ever a UFC Champion or not, he can still do big things and have good fights in the organization. That itself would add to his legacy.