“Does any of us think this would be going on if not for Trump?”
Yes, it would be going on. Cruz lit the fire, said the debates should be led by those who vote Republican, not the liberal media, and they all combined to do something about it.
Was a Cruz rep even at the meeting? I have read that Cruz was one of two candidates who didn’t send a rep to the anti-RNC session, but it was not a definitive source.