GOPe may scare you but they don't have the power this year. They can rattle their cages and bluster all they want. If they choose to go kamikaze then it will be the end of the GOP. I don't see it so I am not going to fear it.
What does Cruz want? If he wants to be president, too bad. That's not going to happen this time around. So all staying in got him was a shot at VP... until the scandal broke. Now he's completely toxic. Trump will make a deal with Kasich or the GOPe before he takes on Cruz's ruinous baggage.
With no path to the nomination and no deals for the VP forthcoming all Cruz's continued campaign accomplishes is to throw the nomination to the GOPe's selection. The GOPe's selection can't beat Hillary. Between Trump and Cruz's supporters a Ryan or Romney or Walker will lose at least half the GOP activist base and be crushed in the general election.
So Cruz, by staying in, elects Hillary.
Thanks a bunch, Ted.