> When do you expect to see this supernode/client scheme to
> be realized?

It was a long time ago that FreePeers (BearShare) created something called Defender (Before Defender was Reflector, by Clip 2). Defender too used the client/server model, where these "supernodes" handled most of the traffic, allowing low bandwidth users to connect to the supernodes and chat, search, save bandwidth, etc.

But a long time ago, expecting to implement the supernode/client model was a bit unrealistic.