Come on mainline guys... I am no longer an airline guy at all, so I will offer a somewhat unbiased opinion. If this would have passed, quite a few regional airlines would have most likely decertified ALPA as well. As much as you like to piss on the RJ types, you most likely were one, or you were the people who allowed them to prosper in the first place. Regardless of that, if enough of them "seceded from the union", you could be in a world of sh*t from a monetary standpoint. If you think it hurt with US Air leaving, imagine ASA, Comair, Mesaba, Pinnacle, PSA, Piedmont, Air Wisconsin, Mesa, TSA, ect all leaving at the same time. The suck would be incredible!
(Note that I have been out of the loop for a while, so my list of dissenters may not be accurate.)