Both sides would love to see Yi with Golden State, as WOW stated. If a trade happens, and with some of the maneuvering going on in the East Bay, it mostly likely will be with the Warriors.
But I also totally agree that this is a bad precedent to happen. The Warriors should not give the Bucks much for a completely unknown commodity. Screw them and Yi for doing this in the first place, as neither side was all that honest with what they were thinking. Yi is so totally unknown that I would not give a second round pick for him at this point.