Deadehad;
Have you read the comments from the republic guys. They are more than willing to do it for less than not just you, but any other regional just to get the flying. Guys outside of your scope of control cannot be held in check. Never. Within ALPA you see no group willingly undercutting each other. Corporations may try but the pilots are not. Look no further than Mesaba to see regional guys fighting back when their flying is being used as a threat to lower their contractual value.
RJET on the other hand (not F9 or YX guys) are willing to under cut their own (YX and F9) as well as majors and regionals all for shiny jets.