Tipping isn't going away just because waitstaff make minimum wage. It's too ingrained in the culture. As evidence tipping still exists and hasn't declined in the areas where those laws are already in effect.

I'm sure there are bartenders making 6 figures, but according to the BLS, the 90th percentile make $40k with tips.

The median pay is $10. That's lower than minimum wage in a lot of places, so I doubt that many bartenders are against minimum wage before tips (none of the ones I know are).