I think if the C's can get Marbury that House is expendable. The catch, however is twofold. First, will Marbury be bought out today or tomorrow? Probably not. So, then can Ainge accurately project that Marbury gets bought out and comes here? That'd be tough, unless he really has some inside information. And two, we'd have to persuade someone to take Eddie. Honestly, he really has little worth in this trade market. No contender is going to want him, because they aren't going to want to give up anything of value to the C's. No team out of the playoffs will want him because he doesn't offer anything for the future or in salary relief. So, while I think that Eddie's expendable, I don't see how he helps us by trading him.
And for those of you who think he's too valuable as our "backup 2," how exactly is that going to work in the playoffs? Is he going to guard Joe Johnson, LeBron James, Rip Hamilton, and Kobe Bryant when Pierce is on the bench? I don't think so. If Marbury is in and Tony Allen makes it back for the playoffs, House isn't going to get off the bench.