If no one has the requisite 1237 and we end up with a contested convention, a Trump/Cruz deal is probably the most likely outcome. It just doesn't make sense for either one of them to allow anything else. If one of them was really, really close to 1237, then a deal with Kasich or Rubio would become a secondary possibility, but still makes less sense. For both of them, working together improves their chances of beating Hillary by guaranteeing some sort of win for them and keeping their supporters happy.
But even though this makes sense, the sticking point is going to be who gets the top of the ticket. Personally, I'm hoping for a contested convention, not just because I prefer Cruz over Trump, but also because if I have to vote for Trump over Hillary, I want some contested convention evidence that he's as good at making deals as he claims to be. Anyone can write a book.
All those frickin' buildings don't mean anything?
So, if Trump is 50 short of the requisite votes and Cruz is 400 short, you would be fine with a contested/brokered convention?
Fuunny how we get really pissed when most politicians work specifically against the will of the People but for some of the "special" politicians, we will allow them to look down their nose at us and tell us how they know so much better what we really want/need - Barbour and them meddled like that in Mississippi and most folks on FR recognized it for the treachery it was - many of the same folks on FR seem to think it's "different " when Cruz does it.
At this point, Rubio showed more class than Cruz as Cruz now focuses more on stopping Trump than an honest win - he's willing to go down some dark roads to thwart the apparent will of the People.