See we know you're kidding now if you consider that Name of the Doctor had appearances by all of the Doctors.
Oh, lord. This is why I have a hard time taking fans seriously. Of COURSE it was appearances... wah, wah, wah, stock footage... but it was the Doctors as the appeared in the show, how much more nostalgic can you get?
Do you REALLY want to see Colin stuffed into a costume he hated? You really want to see Tom limping down a hallway, tripping over a scarf? THAT is how you want to celebrate Doctor Who's history, by rolling out old actors? It seems rather sad, and even a wee bit humiliating.