I'm a PhD student who is thinking about applying to medical school, and in the process I came across your blog. It seems like you know people with different stories about the transition process and I was wondering if you could shed some light on something for me. I'm certain that I want to go to medical school, but I'm not sure if I should leave my PhD in order to do that. Have you found that medical schools are wary of applicants that have left a PhD with or without a masters?
I found that most of my acceptances came with the condition that I have to complete my current program which was PhD. During my interview processes, pretty much every person asked if I would finish my PhD before starting med school, so I think when adcoms review our applications, they do have concerns about that. Also you have to explain why you are switching from PhD to med school somewhere in your application.
So if you plan to quit your PhD, I suggest you just switch to masters beforehand, so it does not raise a red flag. But I do know a girl in my school who got accepted and switched to masters and left with masters, so if you do get accepted and decide to leave your PhD, whether or not if you acceptance will still be valid might depend on schools and your situation. I think you have to send a letter explaining your situation and the school gives an answer. I got the impression in general that schools vary in that regard.
If you are in a masters program during the application process, it is nothing to be worried about as I know many people who went to med school after doing masters. I am sorry that I am giving you somewhat of a grey answer and hope that it was somewhat helpful.