Hi, this idea doesn't make a whole lot of sense I'm afraid.
The difficult part of handling the block chain isn't really storing or serving it - disk space is super cheap and has been getting steadily cheaper for a long time. The difficult part is managing the database that's calculated from it, and verifying updates to it.
Most of the work that's gone into improving Bitcoin lately has been around how to more efficiently manage the database, and also how to serve subsets of the chain to clients that don't want to download the whole thing. That requires servers (nodes) that understand the structure of the chain and the Bitcoin protocol, which obviously NNTP servers don't.
I see. Thanks very much for the explanation, Mike.