Portland would be a great fit, in that they are very much competing, probably could use a rotation big, and are already over the salary cap next year, so Bass's contract would not prevent them from signing a free agent this summer. Their problem is that they have no expirings to send back, and since they're a competing team, they're not going to want to send back a contributor. It'd have to be something like Meyers Leonard, Victor Claver and Will Barton, who collectively would count almost $3.7 million against next year's cap, assuming you waived Barton in the summer. That's only $3.2 million in cap savings, which we probably wouldn't be able to use next summer anyway, and maybe you'd get a second round pick to go with it.
So there's the problem with trading Bass. If you trade him, you're probably going to take a contract that the other team doesn't want, and while Bass's contract isn't great, it isn't large enough to be worth not getting rid of completely, since you need all of it gone to create any significant cap room for next year. Might as well keep him until next year.