I think your implication is misleading. There was B scale - and that was rejected by the pilot groups so the airlines invented the regional model. There was no scope initially because there was no union involvement. Scope came later and has been gradually and continually tightened. The only gives on Scope have been to receive something - and they have been minimal.

The regionals are evolving to become a feeder of a limited resource - pilots - and that too is becoming unnecessary.