You have heard that line before! It depends if the playing field evens out. It depends if the Federal Trade Commission has a spine. It depends if physician groups coalesce into moderate to large groups in order to compete with health systems. Etc. Etc.
I have laid out some thoughts here http://www.acssurgerynews.com/practice-economics/practice-management/single-article/pointcounterpoint-self-employed-community-practice-is-still-a-viable-proposition/05be23899f34765abef2f24391d95694.html