If you think I was calling you an idiot, then you're dumb.
Just kidding.
I guess it is possible. But to me, I think it's just hard for guys to get comfortable in new roles. And, so we're clear, it's not about "these guys get paid millions of dollars, they should do whatever they're asked as hard as they can." If I told you, "I'll pay you a million dollars to go talk to Kate Upton," I'm sure you'd do it. But if I said, "I'll pay you $1 million to be your normal, charming self while talking to her," you might have a more difficult time, right?
Plus, players play their best when they're the most comfortable with their roles as is realistically possible. When you're accustomed to being a number 1 guy, that doesn't just make your ego feel good, it also gives you a sense of identity. If people start telling you you're a number 7 guy, and everyone starts treating you accordingly, it's gotta mess with your confidence.
Look at Steve Nash this season. I'm his biggest fan, but he just wasn't the same player in 2012-13 that he was in 2011-12. Every game in his last season as a Sun, he'd do something that would amaze me. It might just be a pass that had the perfect amount of spin on it to get through the defense in one direction, hit the floor, and get to his intended target in another direction. As a Laker, I didn't see that once. Literally, not once (and, I watched every Laker game this season). Some people might have thought that Nash is just too old (I don't think 6 months = 5 years, though, so I disagree); perhaps he was angry with D'Antoni for letting Kobe assume more of the playmaking role (I don't think so, because Nash was the most vocal supporter of the idea, because he thought it could help the team). But Nash wasn't the same Nash. On a different team, different role, so dissonant from all the stuff that he'd identified himself with, maybe he just couldn't tap into whatever it was he tapping into so easily in Phoenix.