I have been debating it heavily. For how much time I work in my labs, countless grad students + my PIs say I would fit well within a program. I have the capabilities of most grad students even now, but I honestly don't believe right now that the Ph.D. is the "right fit" for me. Yes, I could get through a 4 year Ph.D. program, but my heart may not be in it. I may apply to MSTP for UMN Twin Cities and one/two more programs, but I know I can do research as an MD. Still have a lot of debating to do.