If Trump goes 3rd party, I go 3rd party.
If he waits until the convention, it'll be too late to make a meaningful 3rd party run. That said, if Trump gets sCruz'ed out of the nomination, I'll be writing Trump in from the top of the ballot to the bottom, and will never, ever, for any reason, under any circumstance, vote for another rotten, stinking, filthy, backstabbing, vile, traitorous wretch republican again, EVER.