Would unions complain? Maybe, maybe not. The pilot group would have to vote on the issue.
We're starting to see a trend of pilots flocking to regionals with descent work rules. If the wholly owned regional, which only four exist, have a sub standard contract, they'll have a hard time attracting quality pilots anyway.
PSA just voted in a low quality contract. Endeavor has a low quality contract. Envoy will more than likely shrink. Piedmont is kinda a toss up at the moment. Those being the only wholly owned, it may be hard to sell to the savvy new hire.