He said... "We'll see you later... Maybe next year."
I think it's simply because Bruce knows that the band is old and a lot can happen in a year. Knowing that Bruce himself suffered from many injuries recently, Nicko's cancer... I think he simply implied that he hopes that they play next year (wherever), but a lot of things can happen.
I think Maiden can still be a 20-30 gigs a year band if they choose the songs wisely (as I said before). But we as fans will need to realise that we might need to travel to see Maiden, because Maiden might not be coming in our close proximity.