Businesses so successful that they have no need to do anything weird to their employees are super rare. And non-competes are one of those things that very weakly impact a bottom line. So some Darwinian process with cities and companies or whatever is never going to select for, "No noncompetes."

The bigger question is if you really believe that the "laboratories" / Darwinian process of cities and regulations and states and whatever idea in the first place. It's a conjecture by some credible, mainstream public intellectuals. The biggest evidence for it is cities/states accommodating tax avoidance, which so directly affects the bottom line that it's basically an apples-to-oranges comparison with anything less concrete like non-competes.