With required 4 year residencies on the horizon...what's one more year?

Really like both EM and IM. As someone who would've picked a 3 year EM residency if given the option, a part of me is thinking that with EM residencies about to be 4 years across the board (to go into effect the year I graduate), why not just tack on an extra year and be double board certified especially if I like both? Please tell me if I'm being delusional with this seemingly hot take