Must agencies and creative teams change?

Bob Greenberg and Anne Benevuto of R/GA have initiated a serious conversation about the need for agencies to adapt to a changing world. Their analysis is very simple, but the solutions they require are extremely challenging.
PDF links to their thoughts: Bob on whether agencies can keep up with brands like Nike. Anne on the challenges of complexity.
They point out that brands once simply said things to consumers. Eg, ‘agencies created campaigns to tell consumers that… Pepsi tasted better than Coke.’ Then brands started wanting to have relationships with consumers – hello DM and early attempts at integrated agencies. Now though, we’ve entered an age of massive complexity where brands want consumers to have experiences. But hey, what kind of agency structure can deliver experiences and interactions?
Basically R/GA’s contention is that “by definition, the interface is the locus of a brand’s relationship with a consumer, the place where the two come together, shake hands (hopefully), and actually do something to each other: negotiate the price of airline tickets; download Arcade Fire’s Neon Bible; perhaps even find a dance partner.”
This interface is the place where people do things, say things, listen to things and create things. R/GA argue that the creative skills required to deliver that complex experiential interface is a new, large, amorphous creation they call the ‘Creative Hydra’ – a many-headed creature that is spawned by bolting on additional elements (tech lead and interaction designer/IA) to the traditional creative team of a copywriter and art director.
The tech lead isn’t just a geek that defines what’s possible or puts limits around the creative solution. In the new environment they’re an inventor and the inventions they imagine for particular marketing briefs may well lead to the ‘creative idea.’ Often their invention is the idea.
The interaction designer understands how consumers function in this new environment and and how we can best engage them.

But how do you write a brief for this larger team. Where and when do each of the members best engage with each other? Who is responsible for maintaining or guiding the consistency of experiences across the wide array of brand interfaces?
Here are some additional thoughts on the R/GA argument from Ogilvy and Tribal.



“There is a need to have a circular, amorphous development cycle that involves creatives, experience planners, designers, tech and media in constant dialogue.”
Golly.
I bet there is an easier way of saying that. Such language always makes me sceptical of the genuine value of the idea behind the words.
Now, all this grandiloquence sounds very exciting. But it leaves me with one big question in terms of the creative method:
Are these industry doyens advocating lots (three or more) people around a table coming up with the ideas? (a mini brainstorm). Is it the end of two people going away and coming up with ideas?
The reason I ask is that I think it is a dangerous and ill-considered proposal. The great thing, in my opinion, about the copywriter and the art director relationship is that it creates what William Burroghs refered to as “the third mind”. The important aspect is not so much that its a “Copywriter” and an “Art Director”. More that it is TWO people: not one and certainly not three or more.
Three people create a “fourth, fifth and sixth mind”, to continue with Burrogh’s theory. It is unlikely that these minds will see eye to eye creatively.
How many marriages would work in threes? I may well be proved wrong: but I am sceptical about the trio as a creative unit.
I appreciate that new people are needed to solve new problems. But I don’t know at what stage of the process they will get involved.
Broth and cooks spring to mind.
I am happy to look like an idiot if I have totally misunderstood all this.