Sorry for any confusion. I don't consider McDonald's a tipped server. I'm talking about restaurant workers whose hourly wage without tips is below minimum wage.
The "tip everyone working any service job" is something else entirely.
Obviously a single customer not tipping doesn't hurt a server financially, but this isn't really about a single customer, right? You have to get to a tipping point (no pun intended) to affect change. If we all just gave up on tipping without a solution in place, who suffers? The servers. That's it.
Fair enough on raising prices, but with chains I was thinking less about the increase coming from paying employees and more from "look, people will pay more!"