I think the two most likely players to be moved if they can get an impact center would be JO and/or Wilcox, because of their contracts.
I think Bass would be very difficult to give up, because of the scoring and energy he gives this team off the bench. I also think Dooling would be a guy they would prefer to keep, because his combination of shooting, and ability to defend the 1 or 2 would be huge in playoffs.
Some good points, especially Dooling in the playoffs, but I think if we want size, giving up Wilcox and JO probably isn't the way to go. Bass makes a bit more money than Wilcox, so he'd match up salaries better. And I think there's some level of committment to JO to keep him around for a title run. He's just better off the bench than starting.
And what we're seeing is Bass' ceiling: an undersized reserve PF that can't play any other position.
Well, I don't think you would give up both of them (unless you were getting a REALLY good player, in which case its worth it), but I think a package would be based around one of the two of them, as they are are two most movable contracts, and you would just be replacing whichever you move, with the new guy you are getting back.
As for Bass, I agree that we are seeing his ceiling, but I think what he is giving this team right now is absolutely invaluable. Now, if they are getting back a guy like Gasol, fine, but that's not happening. Chances are, you are getting back another role player in return, and given this teams struggles to score, I think giving up Bass' skillset would be very tough to replace this season.