This post is predicated on a false premise. You are presupposing that one of the establishment candidates will magically make everything OK in spite of the fact that they never have and never will because they already have what they want with the exception of a little tinkering around the edges. Before you even mention Cruz, don't forget that without being able to hide behind Trump while the bricks were flying, he would be duking it out with Paul, Huckabee, TubO'Lard, and Fiorina for fractional differences in single-digits while Jeb owned the race.
The bottom line is that there is no real disincentive to take a wild chance when all the other alternatives would have guaranteed loss. At this point, Cruz can potentially capitalize on the strategy of hiding behind Trump and hoping that he stumbles, but we will have to wait and see how that works out.
How is Cruz "hiding behind" Trump? He is calling him out, challenging him to a 1 on 1 debate... Cruz is a lion, and Trump is a coward in this situation. Are you so enamored with Trump's personality that you will ignore his promise to work with your enemy to further their goals of stripping you of your liberty? What do you say to that? Do you really just want more of the same in Washington DC?