Encouraging people to taste their food, and encouraging cooks to think about their ingredients rather than doing things rote because "we've always made it this way", before adding salt is a good idea. American food has too much salt in it, and people who eat out have little choice about it.
No, I don't think a law about it is a good idea (at least not at this time). Having Fox spend as much time telling people about how much added salt is in their food would probably be more productive than them getting all riled up about this.
But that's too much work...
Cheers,
Scott.