Keep both your cards and your bands active. You can use the AP cards to pull legacy FP, as long as that lasts (see Theme Parks threads, Disney shut them off completely at AK starting yesterday-unknown if they will be back on or not...)
And also, since both the pass card and the MB are active via RFID chip, you can tap your card on the Mickey readers anywhere (including ride entrances) and use it, if you lose or prefer not to wear a MB.