Nope, Trump has peaked, both in the primary, and the general:
http://www.gallup.com/opinion/polling-matters/188936/trump-negative-image.aspx
Not only that, his RCP average head to head matchup shows him losing to Hitlary and Sanders right out of the box.
That's only because he's the one who has taken the heat for bringing up the most important issues of our time. He takes the heat, but has only been priming the pump for a nomination fight. Once he has won, he'll destroy ANYONE on the left. Anyone. That's because he knows how to fight.
Remember, he started with below one per cent in the polls just before he actually announced. It was thought he would announce, and the polling showed him below one per cent. That's a lot like the RCP polls with the two democrats, just plain BS because you haven't started a real campaign between the two parties.
You might recall, the GOPe said McCain and Romney were the only candidates that could beat Hillary in 2008, and 2012 respectively. That meant nothing, it was never true.
If Cruz actually wins this thing, I'm fairly sure the MSM will train their guns on him and take him out in a few shots. Cruz has not been taking the heat from the MSM, because they think he can't win. If he does they will destroy him in short order. They can't do that with Trump. Trump will come out with all barrels blazing when it's the general, he will destroy them, not the other way around.
Sorry to pop your bubble, but that's one of the best arguments to support Trump, not Cruz.