Smaller food portions solution to no tipping?

I was just reading another thread that was talking about how much it costs restaurants to serve food or deliver it, and that they are on razor thin margins and that's why no tipping wouldn't work.

That got me thinking, I know Europe does fine without tips, and I know they tend to have smaller portions. Smaller portions is less expensive for restaurants, therefore prices can stay the same but workers could be paid more.

Our portions in USA are ridiculous, way way more than we need anyway. I'm thinking that is something that would need to change if we want tipping to go away.