That is mighty generous of you. But these candidates have paid an enormous price to get where they are. I can't, for the life of me, imagine anyone thinking a last minute white horse should be nominated.
I didn't suggest a last-minute, white horse. If neither Trump nor Cruz can close the deal, my elected delegates are empowered to negotiate with other delegates (on my behalf) to nominate a candidate who can get a majority. I don't know the rules, but I'd hope that whoever would be chosen in such a case would be well vetted.
And it's not really generosity on my part. That's how most nominations work, in politics and in business. One has to get a majority to be the representative head of any body.