I guess it's a double edged sword. What if you grab the "Wrong" band (for those that have many), what if your band selection is based on your "Mood" Today I want blue, tomorrow I want grey (or whatever).
Funny thing is, we only have one set of MBs from our trip in 2014. We are planning our 2016 trip and the DW pointed out that in MDE, we have 4 "Active" devices (1 MB 3 Cards) and she was thinking (as they say they are "Admission Cards") that they were tickets. Funny thing is, is that our last trip was in November 2014 (with a MB) while we were planning others, we ended up changing (now currently planning Nov 2016) so where did all these cards come from? Were they assigned at the point of reservation? were they from the trips prior to November 2014 (our MB's from 2014 are still listed too)
You can go and "Deactivate" them but I do agree, they should probably expire, much like the tickets (after first use) and even the Refillable mugs (after 14 days).
Of course I also wish they would come out with a MB that had a replaceable battery (at least the ones you purchase), but I guess that's another thread.