Let's not forget PSA has done this before.

Back in 2002 give or take, PSA PDT and ALG agreed to not fall for the whipsaw then being shoved down the collective WO'ed throats. The deal was, nobody would accept RJ's for less than x amount per hour. Well PSA, as is now their normal operating procedure, made a deal for less. thereby cutting out the two other WO carriers.
Again this was not a deal where the carrier would say no to RJ's, just not agree to fly them for less than the common agreed to rate.

But as we all know now, hosing PDT and ALG was not enough for them, they had to get the whole industry.

PSA can not be trusted, they will sell out anyone in order to get just one more jet.
Management just loves them.