Cruz just wrote off the low-information, un-engaged Trump voters who are kicking his ass. He’s butt-hurt over losing his southern strategy to Trump. That’s too bad Mr Harvard grad.
Drumpf’s voters are mostly overt and latent racists who think Drumpf will rid America of brown people and Democrats who KNOW he can’t win. Those will be harder to find in closed primaries and outside the South. When Rubio drops out, we’ll how Drumpf’s support looks. And if he does get more delegates by the convention, there’s no way he has a majority (he needs 60% of the remaining delegates for a majority). Drumpf and his low-info cult will find out that having ground game trumps unlimited free media exposure.
I’d guess it’s more like he is disappointed that people have been/are sucked into trump’s void.