Oh wow! haha, you put forth quite the dilemma that makes it difficult to give an answer to clearly. I kind of feel like you are asking a question(s) indirectly...
Is your question whether you should accept this program now and actually do it, but are feeling unsure because you are truly think your stats are good enough to get into TCOM; thus you don't really even need this program nor want to be in anymore debt (or have less money) than you absolutely have to?
Or is the real question whether you should take the time (the next year) that you would have spent in this program to work in order to earn more money; so that when you apply through TMDSAS in May 2018 to TCOM for the upcoming 2019 class, and hypothetically get accepted into their program, you will at least have a more comfortable cushion of money to rely on or whatever?
Anyways, to answer what was direct - yes, I have heard some stories by reading last year's thread for this MedSci program of that happening. To be brief, some people who had initially accepted their offer to this SMP ended up getting a late offer to medical school before/during the start of the Master's program; for which they then squashed their plans for the obvious better plan of attending medical school that same year (key word). However, that wouldn't be your case because the time has already past if you had not applied for TCOM back in May 2017.
Having said that, I think your stats/unique resident classification make you a good candidate for gaining acceptance into an osteopathic medical program (at TCOM), but I know that my own gut would probably throw itself up if I chose to decline this specialized master's program, and then ended up NOT being accepted into TCOM.
Nonetheless, I would go with the gut for now, accept this program, and then check back with it in the near future to see what it is telling you...
Side Note: personally, I would LOVE to be the one that ended up getting accepted into this program because you decided not to pursue it, and your seat opened up. You should know that I have way lower stats than you, and have yet to be accepted. Therefore, I know this particular program would definitely help me out, whereas it might only help you out some. Still, help is help, and you should take it while supplies last.