There's a certain irony that at the time WotC (or Hasbro) seems to have its handle on the brand (including a fake Lego release), the tabletop game that it is built on is in hibernation.
I think the stronger point is that the D&D brand is so strong that it can easily survive six months of RPG hibernation.
But hibernation isn't even the right word anyway. The 4E products are still on the shelves. People are still playing the game and occasionally buying the game. Just because there isn't a "new shiny" on the shelf the next time a player walks into the Barnes & Noble games section doesn't mean the game is dead. And for a great many players... if there isn't a brand-new "Draconomicon 2" on the shelf in March, maybe one of those other six or seven 4E books they haven't bought yet will be an adequate replacement purchase.