Regionals won't be paying any less, unless their pilots make concessions (bonuses and paid ATP are gone for a while though). The way regional pay will drop is simply by inflation over time, since they don't have leverage for pay increases. It would take some number of years for inflation (or worse, scheduled contract expiration and rebids) to push regional pay down too much.

This thing is obviously going to hurt, but I don't think it will drag on long enough to crush all of the recent labor gains... the general attitude of most pilots seems to be "furlough me before concessions".