I certainly don't know what the future hold for POB but right now he is not good enough to play and moving him to PF isn't going to change that. I see strong positives and some pretty scary negatives. I think he is worth waiting couple of years to see how his body develops. He is only 22, a lot can change. The payoff could be a smooth shooting big, kind of a Duncan light. What's a couple of million dollars, chump change by NBA standards.
Amazingly GG is also only 22. It seems as though he has been around way longer than that. I admit that I was guilty of thinking that he was going to figure it out and be good. I think GG still has more tools than POB, he is smooth, good reactions, the whole package. The part he doesn't have may be the hardest to get though.
Both POB and GG are still young enough to get a few more chances though.