They may, but sometimes rooms also become damaged due to rock stars throwing wild parties, or more mundane things like when we noticed a concerning amount of water dripping through the ceiling in our bathroom in Denver. Once they came to check it we got a free upgrade to a larger room.

I don't think keeping unbooked rooms "just in case" is economical so if this sort of thing happens you may well need to be moved out to a nearby hotel at their expense.