Seems that for most people, sticking with a regional is better for their career atm. When i was at WIA, i asked UAL and delta this exact question if going to a LCC would give me a leg up. Neither said they cared about the airbus type. Both said PIC time in the 145 would be preferable to SIC in the airbus. They even said I'd be better sitting tight and building the 85 hours of sic a month I'm getting, than being out of the cockpit for training and reserve, etc.

IMO, let the shortage hit the LCCs. Maybe they will be forced to start paying a salary more competitive with the type of aircraft they operate.