That poses a substential risk to the business. You are changing your entire customer base over night. If you are a small restaurant like the one in the article, it is unlikely, that your earlier customers will book month in advance, even at half price.

Your old customer base was hopefully working, but your new customers expect the words greatest burger. Can you deliver on that hype?

The owner above payed month of utilities for an empty restaurant and has to make a sizeable investment to cater to that new customerbase.

Unless you didnt have a functioning business model beforehand, this is a real curse and puts your livelihood at stakes.