I don't think either team would do this trade, but the Pacers would probably be a bit more reluctant than the Celtics just because centers are tougher to find than point guards. It's true that both teams have holes that could be filled by the other team's player, but by making the trade they'd be creating new holes. For the Celtics, I can see the logic because like you said, centers are tough to find and they may be more confident they can find a point guard in the draft or via trade. For the Pacers though, a large part of their identity is dominating around the basket, and Hibbert is the main reason for that. Yeah, by trading him for Rondo they'd probably have an easier time scoring, but they also probably will no longer be the dominant defensive team they have been the past few years. The trade wouldn't make them a better team, just a different one. That being said, I wouldn't want the Celtics to build around Hibbert because he's useless unless you play a very slow, defensive-minded style that I'm not sure can win a title in the modern NBA. I'd rather build around a guy who's a bit more versatile.