Amare is the PF version of Allen Iverson. He scores, but provides nothing else at a high level. He's an average rebounder for his size, not a good passer, doesn't play defense, doesn't make anybody else better (except for Scal). If he ever wins a championship as the focal point of a team, I'll be surprised. Your best player needs to be able to do more than just score to have a chance at a championship.
With that said, I would have put Melo in that category before this year, but he grew out of it. It is possible for a player to 'see the light'. It's entirely possible that the same could happen for Amare, and he could become the kind of big man that champions are built around. He has that kind of talent.
Am I willing to bet the team's future on it happening? Not a chance.