They're already working on it.

"make long distance travel slower and more digestable, like a cruise ship on land."

I don't see how that would work. Cruise ships are an enduring business model because even when they're not at in a port, they have the necessary space for tons of amenities to keep guests entertained.

You could never fit anything comparable on a train or a bus. Not without creating some sort of lumbering land-behemoth that would end up producing more greenhouse gases than it would save.

QA tester at a gaming company here.

Writing new code isn't the most time-consuming part of the production process, but generative AI could streamline 3d asset and texture creation.

Given enough development, it could even make a significant portion of QA redundant. We already use automated tools for the more repetitive parts of the job, like gaining huge amounts of XP. We could probably use bots to watch for hiccups like graphical corruption or physics errors.

I'd say your speculation is pretty plausible. Devs are always looking for ways to get an edge, and AI might be the ticket.