Just as many CRJ guys get hired at SWA, Delta, and United. Nothing to do with "glass" cockpit or underwing mounted engines. It's because many of them were LCA, CP, sim or ground instructors, or spent some time in other leadership roles. Majors couldn't care less if you have thousands of hours in ERJs. Another reason they like CRJ drivers is because they know it's not as automated. It's more "hands on" than the ERJ. Skywest CRJ drivers fly all three versions as well.
It's the experience you gain and leadership skills that majors are interested in.