I believe there is too wide of a spectrum of pilots even within one airline to accomplish such a industry-wide referendum. Older pilots for example do not want to jeapordize retirement income in order to make sure first yr FO's get a higher pay rate.
It needs to start with the new hires picking the best airlines to work for. That will, in turn, force the lower end airlines to match the QOL and pay.
What ALPA can do is develop some kind of program to help new pilots wanting to become airline pilots and CFI's who are building hours toward an airline job to help guide them. Besides these kind of forums and word-of-mouth info, no one knows what is a good airline besides a quick upgrade and first year pay.
In fact, I have seen posts on this forum recommending for a CFI to go to the airline which has the quickest upgrade without any other considerations. THAT is the problem right there.