Several of the things people have suggested just aren't practical with the WDW system.
Double Decker buses? I don't think they would fit under the water bridges. Not to mention most of the entrance plazas, overhanging trees, etc.
GPS tracking of the buses? Disney does seem to have this in place for their internal purposes. But giving this to public wouldn't work well. WDW reroutes buses all the time. So a bus that had been planning on going to MK gets sent to AK, that messes up all the tracking someone had been doing.
Special music? Each route already has a different playlist set to your destination.
Interactive drivers? As much as I do miss the ones that used to do this, it is a safety hazard. If a bus was to crash and the driver was distracted because he was trying to think of the next trivia question, it's not good.
So what are your suggestions then? We'll listen to any ideas