I would certainly vote for a candidate who advocated such change, even if I disagreed with many of their other policy stances. Would you or do you just want to place the burden of reform where it is most easily placed? Are you willing to forego spending money at any place that subsidizes employee wages with our tips, which, done en mass, would have a much great impact than simply not tipping? How about the raindrops of your vote for candidates who advocate reform or voting with your wallet based on where you spend money?
To answer this, no. No I do not place this single issue at such high importance that it supercedes a candidate's stance on issues such as crime, inflation, energy, local/national security, etc.
And when I go to a restaurant I make the decision based on the quality and price of the food with respect to what I want to eat. I'm not there to dictate how the business is run. If someone wants to run a restaurant then they can buy or start a restaurant and run it in whatever glorious way they see fit. Of course, then they might get slapped in the face by economic realities.