Its not about what ALPA has done, its about what they haven't done. Its all about the $$ with ALPA and I think deep down we all know that. If Skywest did go ALPA, wouldn't the ALPA merger policy require that all three lists merge? I'm pretty sure it is required in black and white at that point.
I'm pretty sure that all ALPA carriers within a company MUST be on the same list.