...there is word out there that they are looking to transfer or sublease to another carrier who has a more compatible fleet. They're nice aircraft (and pretty new at that), but a little costly to maintain a sub-fleet.
As for parking M80's, I hate to burst bubles, but people don't sit in HQ and think of ways to simply keep from re-calling people. Is it part of the equation, yes, it has to be, but it is not the sole motivator...not even a top 10 one. If they need people, they hire, if they don't, they don't. The rationale behind parking aircraft you still have payments on is pretty simple. By reducing total ASM (supply), given a constant (or rising) demand, you can increase prices. The last announcement that came out was that AA was going to park almost 30 M80s. With a fleet of over 300 M80, the lease payments of these get spread across the remaining flying aircraft. It's more likely that they would increase revenue per aircraft still flying enough to cover the lease payment alone than fly them and not lose tons of cash on gas crews and incrementals...