I don't think that Bass's contract status is much of a negative at all. For some teams, it may even be a positive. Below are the teams that are all very near or above the likely salary cap of $61-$62 million for next season. Those teams aren't going free agent shopping except through the MLE, etc, so adding Bass for this year and next wouldn't decrease their flexibility much if at all. I'm not saying all of these teams are perfect fits -- just that Bass's salary next year shouldn't be seen as much of an obstacle.
Brooklyn
Chicago
Denver
Golden State
Houston
Indiana
Clippers
Memphis (assuming that Z-bo doesn't decline his player option)
Miami (assuming that the Big 3 hang around)
Minnesota
New Orleans
Knicks (assuming Stoudamire and Bargnani don't opt out, whic is a pretty safe assumption)
Oklahoma City
Portland
Sacramento
San Antonio (they have a choice between ~$8 million in cap space, or Bass + MLE + BAE)
Toronto (they have a lot of partially guaranteed deals that could technically create a bit more room than some teams, but it's unlikely they waive everyone, and even doing so creates no more tha $8-9 million in cap space).
That's 15-17 teams who aren't losing much/any roster flexibility if they took on Bass's contract for next year. Accordingly, Bass's contract alone will not be the impediment against him being traded. If he isn't traded, it will be some combination of his play, the C's desire to trade him, and what they want in return.