I doubt they ever will, either. That would make the whole process of loading much slower than it currently is. Even if they had an automated system that could read everyone's band as they were boarding, it would cause slowdowns if they have go pull someone off the bus that isn't supposed to be there. Plus some people don't even use the bands. It's a bigger hassle than it's worth, considering the vast majority of people using the Disney buses are staying at a Disney resort (other than for park to park transportation, and that's not an issue for this topic anyways).