Too late, it's already a disaster. People already set their iPhones conspicuously on the table _between_ themselves and their conversation partner. And then they check the phone compulsively.
At least it's a quick way to discover you're having dinner with somebody you really don't want to be having dinner with. Used to be it took hours of conversation to suss that out!
Indeed! I had one lady answer a text between the drinks and appetizers. I paid the check and left. An expensive snack but a priceless look on her face ;)