In a word: "Yno."
Poke is currently getting a lot of press from their BakerTweet invention - an industrial looking box that sends Tweets announcing croissants and buns are fresh out of the oven.
Is this what ad agencies need to become? Or does Poke live in its world and let the Goodbys and Fallons of the world live in theirs?
I think when an agency positions itself as an "ad agency" it becomes much more difficult to sell anything but advertising to the client. Even media-savvy clients are likely to say, "Yes, you handle our advertising, but we've got other suppliers to handle special promotions, online work and other marketing."
If you want to sell more than advertising to your clients - even ambient media installations and PR events - you've got to begin by positioning yourself as more than an ad agency. And that's got to be a top-down decision. It probably won't happen just because a writer and an art director had a pretty cool idea that went beyond the print brief.