Sorry. You’re wrong. The “incentives” would be construed as unfair by the slackers in the group. Waiting on tables is a different mentality from sitting at a desk. Job skills are the same too. On a construction site, you move up the ladder after you learn a trade. Laborers get $10 p/h. Crane operators, brick layers much more. And the laborers can see that they earn it. Nothing will be “fair” again in this restaurant.
Why are you so sure I’m wrong. There are plenty of restaurants here that have eliminated tipping, and plenty of other countries that have done so as well. Service has not suffered.