I'm not a fan of Cruz, but he is my pick for who is left on the Republican party. I think he's more fit to be a Supreme Court Justice than he is a president in all honesty.
Plan A: Bernie for president
Plan B: Anybody but Hillary/Trump
Plan C: Anybody but Hillary
I don't want Cruz to drop out. That would almost certainly mean I'd have to vote for Trump when/if it's Trump vs Clinton. I may dislike Trump, but voting for Hillary will never happen for me.
As for the bold part of your post, I actually agree. The difference is, I know Bernie means what he says where as I have to hope Trump means what he says.