They may not be happy campdoag, but remember they also decided to join the company under that eba. It isn't like it was forced down their throats AFTER they joined on different t's and c's. The real point becomes who can do what for the NEXT eba, which is why there are quite a few of us who have membership of both at this stage. Certainly, whether I retain both will be decided by the outcome of the upcoming negotiations, and which team does what.
BTW, I'm not suggesting they should be happy, but you have no right to piss and moan when the eba is there for you to read BEFORE you sign on the dotted line.