We at the majors are the ones responsible for the amount of flying at the regional level. When most people hired on at a regional they were "green" as to the politics and policies of airlines and their unions. If you want to stop this you need to do more than just point fingers at the guys who sign on to make 20 bucks an hr. They do not know any better. Why? because no one has taken the time to tell them.
Educate, and if you are going to farm out your flying, put stipulations on who gets it and for how much.

We at the mainline level want the regional pilots to make a ton of money. The more you make the closer your costs are to the legacy the flying undercuts.