Apart from the obvious spectacular celebratory multi-Doc episodes..
I'd like a SERIOUS weighty tome on the series from inception up to the most recent episodes they can include. This to be filled with rare photo's, interviews with everyone involved in the show, past and present. Something like the recent Star Wars coffee table book.
A top quality immersive video game with a decent plot, graphics and imagination!
A double or triple album cd with incidental music from the shows 50 year history. Obviously ALL of the original versions of the theme to be included.
That'll do for now....