Oh, thank God for that much, at least. The other guy whose name was I saw getting floated as a replacement was Steven Witkoff, a real estate guy that Trump used to talk to Ukraine and Russia. I'd vastly rather have Rubio there.
EDIT: Also, OP, you've got a typo in your submitted text:
Maltz
Should be "Waltz". Not sure if that was in the original article text or not, but if it was, it's "Waltz" in the current article text.
Honestly, he could just bomb Iranian oil infrastructure, has explicitly stated within the past month that he will bomb Iran if Iran doesn't comply, and my guess is that that'd be a Plan B. Like, the Trump administration doesn't lack for leverage here if it wants to terminate Iran's ability to deal in oil.
https://www.reuters.com/world/trump-says-there-will-be-bombing-if-iran-does-not-make-nuclear-deal-2025-03-30/