I can't think of one regional pilot group that jumped up and down and said. "Hey, lets steal a bunch of scope from those mainline guys and do it for really cheap, and then maybe someday we will all make it to a major." Nope, it doesn't happen. As much as guys don't like to hear it, Mainline sold scope, and that is that. Sure, maybe they had a gun to their head and where forced to do it, but why should the new regional pilot then be the one to have a sense of righteousness and not take a job paying low wages? We all want to move on, and you can't do that without 121 time.
Regional unions are focused on making their qol as best as it can be, not stealing jobs, because we all know it is a place that many will end up staying at.