I'm heading to Vegas 11/25 - and several people have offered to meet me, who aren't even regular travelers. I think some people will cancel plans with places with high restrictions - many will still follow thru with plans - and perhaps some of the cancellations will be made up with low prices and people willing to pull the trigger.
If I look at the online newspaper and it states Vegas is shutting restaurants/bars and other significant restrictions - or if Hawaii ends the Safe Traveler program (both of which is a real possibility) - I will cancel my plans and go another time. This goes for people planning on going to California or Oregon - I'd just cancel given all the restrictions right now.