Because that was not the intent of outsourced work that regionals are supposed to do. There is absolutely a huge reason why one cannot make a regional career choice, see Envoy and Comair as evidence. Regionals are all competing with each other for the same legacy flying and it's all a matter of who can do it cheapest. Todays regional winners can easily become tomorrows losers and vice versa. Can you peg a 30+ year career on that bet?