How can you improve gnutella network? By improving the clients! You can improve your own client, but not others. I can't see your point.

And what comes to clustering, it is necessary because some clients have implemented great features wich are useless if there are no other clients to support them too. So, let's cluster the clients closer together and the new feature will work.

When there are no clusters, all clients are workins as they do. When clusters are formed, the clustered part is working propably better than others. The non-clustered part is still working as before. Clustered and non-clustered parts are still tightly connected together and can get files from each others. I can't see what's wrong with that.