I'm a little late to reply, and perhaps this was already mentioned, but I do think that MagicBands will be phased out. Not necessarily soon, but eventually.
MagicBand 1.0 came out in 2013, right? Apply Pay and Google Pay (former Android Pay) were released in 2014 and 2015 respectively. Now that more and more people are using their cellphones to make payments, I'm sure Disney is seeing the potential savings if they were to allow ones cellphone to do everything the MagicBands can do. You already need your phone if you want to modify any plans that were previously made in MyDisneyExperience. Why not let the guest provide their own hardware?
I'm definitely in the MagicBand boat though. My wife is usually the one modifying any of our plans, so I luck out and don't really need my phone in the park.
Besides, I prefer to look at a screen as little as possible on vacation. That's why we go to Disney over Universal.