One thing to consider for all of the FO applicants is that you are not a required crew member and all PICs are able to fly single pilot. I've heard that FOs can be bumped or asked to sit in the back for weight and balance considerations as well. FOs are not required to maintain night or IFR currency either.

Many have moved on to regionals, but some 91 or 135 operators may not accept the SIC flight time.