As a precautionary measure, I believe it should be extended to all institutions where pathogenic contamination could be spread to others. In my own mind, that primarily means hospitals.
Should restaurants be included? I don't know, but my personal opinion is that they should not. Of course, a restaurant patron may not like to see water spots on his wine glass. But people have got to make a choice: do they want sparkling clean glasses or do they want to protect the environment?