I'm an admitted Jones hater. But here is what's what.
UFC should have scrapped the fight. Crushing after the big press conference etc., but was the right thing to do.
Unless Jon's fight blood tests show something, fight result should stand.
I wouldn't strip Jon of the title. I would fine him. I would, along with medical staff and Jons agent develop a plan of treatment and specific expectations going forward regarding testing and behavior and what the penalties for future violations will be.
I would make Gus and Rumble for an interim title to give Jon all the time he needs to deal with however deep his issues are. He needs to go take care of this and do it right.