If everyone ate more plant-based food, they'd probably be getting their protein in anyway. Beans, legumes and lentils are all full of protein, and that's without even considering processed plant-based products like tofu or even meat-like products (Beyond or Impossible products for example.)

That said, while I absolutely champion people eating more plants, I'm far from vegan or even vegetarian. My diet includes meat, cheese and eggs. Not every meal needs to include meat though. I just think most Americans at least would be better off with a more well rounded diet with less processed food and less sugar.