That's exactly what I envision as well. If Trump/Cruz win the GOP nomination, there will be a riot in the convention the likes of which no one has ever seen. The GOPe will bolt the Party.
Then, a unity ticket will be formed from the UniParty for the sole purpose of defeating Trump/Cruz. I think the PTB will choose Hill and Rubio.
I Was thinking about this last night as to who would be the veep on a unity ticket, and I came to the same conclusion: marco. Complete political opportunist, checks the hispanic box, is of essentially the same kleptocratic political philosophy as piaps. That and since he has decided not to seek re-election to the senate, he is going to be unemployed. I don’t doubt that he would do well on K street, but I think he is more hungry for power than most.
Once the dance has been decided on, all that remains is choreography.