Universal would be best served doing a MB type system, but all done through smart phones as Disney has transitioned to. You no longer even get free Magic Bands upon arrival at the hotel anymore, they highly encourage you to use the app for everything (room key, mobile dining, diner reservations, booking park passes or fast passes normally, etc). Universal doesn't need the actual Magic Bands, but if they built up the app more, they could build a service that would presumably allow for them to hold you park ticket, express pass and hotel room key on the app at the very least, while pushing mobile ordering as well.
It would be a much scaled down version of what Disney is doing, but I think most would agree that's probably not a bad thing. Keep the good parts, but get ride of all the unnecessary planning aspects.