Not sure of the exact year, but the Transportation and Ticket Center colors were meant to match the Disney road signs when the "Disney Transport" brand was introduced (1989 I think, but I'm open for correction). That's also when the buses and trams moved from the orange and brown colors.
Now that the buses have moved on, it's time for the TTC to change as well. Unfortunately, it's going to take more than some character wraps to dress this area up. Maybe some classic topiaries? It doesn't need to be flashy; it just needs to not look dated.