That's a good question, ual4low...I really don't know stats about previous strikes. I guess Skywest might cross (not being ALPA), but I would certainly expect ALPA regionals not to...and for ALPA to provide that specific direction if and when the time comes.
If an ALPA regional has ALPA pilots picking up struck ALPA flying, then none of this union stuff makes much sense to me. Too much creative loophole BS for me. Let's keep it simple: Honor the picketline or get branded a scab.