That's exactly right. That's for all his bluster in the Senate nothing really changed. He's not a leader...i.e. he cannot convey a vision and/or get people to follow his vision. Even IF the establishment somehow let's him get the nomination and even if he doesn't get squashed by Clinton then he would be a weak President unable to lead or inspire his colleagues or the American people.
I’m not supporting Cruz anymore, but when those that have been there for much longer than Cruz have much more to lose, they’ll refuse anything that would deny them power and status.