I know VERY well that this isn't an ideal plan, but some med schools don't accept undergrad credits after a certain amount of years have passed. However, getting a Master's degree "stops" undergrad credits from expiring. It would be ideal to get into med school right after undergrad, but it's more realistic to have a back up plan in the event that I don't. I'm not getting a Master's to improve my admission chances. This is mainly to stop my undergrad credits from expiring so I don't have to retake them. My parents support me getting my master's degree as well.
Don't get me wrong; I really, really want to become a doctor and I would love to get into med school via the traditional path. With the rising competitiveness of admissions, however, that may not happen.