Simple question...are you ignorant? Or just plain simple? How is a hub and spoke network carrier going to operate without their feed from the small outstations that a 100 plus seat jet could not possibly serve? I can say though, that RJ frequency needs to be drastically reduced and replaced with larger jets in many markets. BOS-LGA...LGA-DCA. There is no reason AA, US, DL all need 8 + flights a day back and forth between these cities.
RJs should be used on routes like DTW-FWA, not DTW-LGA. RJs are clogging up airports that they have no business being in. Any route that is served from LGA can sustain a bigger aircraft. The legacies simply choose to use RJs instead so they can have 12 frequencies a day instead of 8. It's clogging the system, and there should be some regulation to stop it. I'm tired of sitting number 20 in line behind 15 RJs, two turboprops, and just three other mainline airplanes.