I don't think that you will be working any less than what you're doing right now na kha, but I maybe wrong, I just says it based on what I've seen the medical doctor fellow working in my lab na kha, he's a pediatrician specialized in infectious disease and may have the most super busy schedule that i could ever imagine. However I don't think it'd be the reason that makes you hold back your thought na kha, I believe you're well trained and prepared for doing this na kha.
From the pros and cons you're giving here, I'd say just follow your heart na kha, if you want to do, go for it kha. Good opportunity's not always come to any of us na kha please keep that in mind, especially if your family supports you, and you basically have nothing to worry much about, I'd recommend you to do it kha.
It's just another opinion na kha, and you're always welcome na kha if you have any question, even though I'm not a medical doctor na kha, may not know much about the detail of how the whole thing of this scholarship and training would be like for you but if you happen to come to the Ohio State U., then I'm more than happy to help kha.