Frankly, Mesa doesn't have the cash or creditworthiness right now...
First off, their available cash is under $100M, and Aloha's case is going to trial this coming fall. There's no hope of a settlement at this point because Aloha has nothing to lose by losing.
To add insult to injury, Delta just canceled their ERJ-145 contract with Mesa today due to failure to perform. That's another 36 RJ's that have no home.
UA just signed up with ExpressJet for lift to offset what Mesa's been canceling on their contracts, and it wouldn't surprise me if UAL followed suit and gave them notice for failure to perform.
The only possible buyers I can think of are Alaska or Southwest. Alaska running in Hawaii would be ironic, to say the least...