I think some people don't understand the nuances of cap-ology. Nate Robinson is an upgrade over Eddie House as a trade asset, if Robinson can prove himself to be a more mature player in a bench role. No one was ever going to trade for House because they wanted House. Nate Robinson is a young player who has a chance to be developed into someone who another team actually wants. Maybe Doc Rivers, if he comes back, can guide Robinson the way he did Rondo and develop a better point guard.
For Danny Ainge, the difficulty is in predicting how Nate Robinson will develop. If the upside is worth the risk, then an attempt should be made to sign Robinson to a 2-3 year deal with an eye toward trading him after a year in some sort of package. Imagine if, at some point in the future, instead of offering Scal, House, and JR Giddens, you can try to upgrade the team by offering a more mature,less selfish Robinson and the expiring contract of Rasheed Wallace?
To determine what the Celtics should do with regards to Nate Robinson means thinking beyond next season.