Cruz won't pull it off. We're heading to the parts of the nation, the major population centers where he is weakest. Trump is half way there in the delegate count with 21 States to go.
It all boils down to who California will vote for in their GOP primary. If they vote for Trump he'll be the nominee. If Trump loses California, even if it's to Cruz, than it will be an open convention. If the Convention choses someone other than Trump, and Trump will more than likely have a plurality of delegate...SHIT WILL HIT THE FAN!
Best assessment I've seen yet.