Hmmm, I dunno, I mean combine that with some type of storage solution at E3 and it makes sense. Sort of their way that they have not forgotten the core gamer. A new dungeon for Twilight Princess, new galaxy for Mario Galaxy, side quest planet for Prime 3.
Still, the rumor is rather vague. I think it would be more believable if it was every FIRST-party Wii game and not every single Wii game. I mean you have Rockband who just said it was completely impossible to do something such as DLC for their game (proved wrong by World Tour), so I doubt that all of a sudden they will change what they said as they already are looking forward to their second iteration of the game.
I at the very least do believe we will finally see some talk about a storage solution, but DLC for every game...well, that would make too many people happy. We can't have that now can we.