That would devastate the wait industry. Few people are going to be willing to work a minimal wage to serve food when they were earning $400/shift by providing great service.
Either way, the waiters and waitresses still have to pay taxes on expected tips. So if they are already making below minimum wage, it will sing even lower.
Tipping should end. If these people don’t like their wages, let them find a new job. Restaurants will realize they have to pay decently and directly.