Well it will really depend on what Scott has that Kang needs. Thanos needed the Tessaract from Thor's ship, but he only killed Helmdall and Loki for resisting and left Thor alive, and the Hulk got away.
Considering Rudd's ever-present star power, maybe Kang decides to kill the Wasp instead, thus completing many of your bad-hair day dark fantasies about her. Cassie takes over as the new Wasp and Scott goes serious into the Avenger movies.
There's also this quote from the director of the movie in EW
"I metaphorically kicked in Kevin Feige's door. People felt like, Oh, these are fun little palate cleansers after a gigantic Avengers movie. For this third one, I said, 'I don't want to be the palate cleanser anymore. I want to be the big Avengers movie.'
I grew up a real Marvel comics nerd, and there are a handful of antagonists in the Marvel comics universe who are all-timers. Loki, obviously. Doctor Doom from the Fantastic Four. And Kang the Conqueror. In conversations with Kevin Feige and Marvel, it was like, I want to put Ant-Man and Wasp up against a really formidable villain in this movie, and so we're doing Kang the Conqueror."