On one hand, I blame him because while Phoenix made a great run, I think anyone who knows basketball well knows that a team built like that likely will never win a title (see the Suns of the past 5 years and the Dallas Mavericks).
On the other hand, how "proud" of himself would he really be playing 15-20 mpg off the bench on the way to #18? It's one thing when you're a perennial role player like P.J. Brown to do it. However, when you're a guy like Grant Hill, I'm not sure a title means as much unless you're a big part of it. So in that regard, I don't blame him for trying on a team where he started and played big minutes.