If this was true competition for med school spots would be a lot lower. On the contrary it's getting harder: you now basically need a 4.0 to get in.
Some of the best and brightest definitely are getting discouraged, I too have similar personal anecdotes from my daughter's peers. But anecdote does not necessarily correspond to data. Competition for spots is the data.
> burn out and leave.
Here the data definitely supports your argument. Doctors are leaving the industry at far younger ages than they did in the past.