You can also remove chairs rather than blocking them off. If your patrons can't eat, your rating will drop. But it will pick up almost immediately as soon as you make the chairs accessible again. But again, I have to wonder, if you have that many servings of that many dishes set out, you won't run out in a single day. As a matter of fact, I've found the more food I have out, and the more food in a single stack, the slower the food sells - so sales of my regular food really slumps when stacks of goal food accumulate. Plus, once you hit 40,000 servings in a stack, selling out of that stack slows down to a crawl unless there's really nothing else left.