You're right - depriving people of choice can cause bad doctors to stick around longer because patients are forced to go to them. This is why we need something

You're right - depriving people of choice can cause bad doctors to stick around longer because patients are forced to go to them. This is why we need something like single-payer - no one should be forced to go to a bad doctor because their private insurance decided to only have one or two options in-network locally.