And even assuming there was a real possibility of a draft, depending on how it’s implemented, taking/not taking a gap year may not make a difference.
There have been cases in US and other nations’ histories when college students in the middle of their academic careers were called up. While there have been academic deferments, that’s not always guaranteed and can be limited in scope.
Sometimes that meant one had till the end of that academic semester/year before reporting for training. Other times, especially during major wars, even that wasn’t always guaranteed.