Really hoping it'll be Cruz, but unfortunately, Trump has a good shot here.
On the bright side (for Republicans and conservatives), sidelining Cruz early means a better chance for the establishment to pull Rubio or maybe Kasich over the line in the later primaries and make the general Lean R. Unless you actually think Cruz would fare better in a general than Rubio or Kasich? IMO Cruz has Reagan potential if he managed to win a GE, but he needs a new recession to get there. Rubio or Kasich would be favored in the GE but either could have G.W. Bush problems with the base by 2018.
However, the establishment pick hasn't done so well for the GOP the past couple of cycles. The Republican voters did not like McCain or Romney. Maybe a fresh face is what the GOP needs? That said, I'm still voting for Rubio, a borderline establishment/tea party candidate.