What are hotels going to do.. charge by the gallon?
yep ..coin operated showers ....are just around the corner....
Just set them up like the condo in Steamboat Springs I stayed in with some friends. The hot water heater supplied about 10 minutes of continuous hot water. If your shower went over that it got very cold.
In little Tusayan, Arizona (gateway to the Grand Canyon), ALL water is trucked in....the faucets and showers all have timer-thingies that shut ‘em off fairly quickly.
It might be a lesser cost for the hotel to charge by the minute and you will need to have your credit card handy for each minute. It will come to that under a totalitarian's theory of a "free market".