Don't we already have Airbnbs in the game? I can see no difference between the rental system and Airbnbs.
I don't think hotels are coming. SimGuruGraham probably just didn't say it off the bat because it would bring hate to the pack, so they're waiting for the livestream to say there will be no hotels, because at least the livestream will show a lot more than the trailer, and the pack won't get so much hate after that.
As I said in another thread, I'm not sure how to feel about them adding the rental system to all the worlds. Since Mt. Komorebi will be both a residential and a vacation world, I'm assuming we can visit it any time, like we do with the other livable worlds. So, if I live in San Myshuno and want to go snowboarding, I can just go there and spend the day, without paying for a vacation, and just come back home at the end of the day. Same thing with Sulani. Why would I pay for a vacation there if I can go to the beach for free any given day?