Nice post, I haven't heard about this before. Thanks for sharing!
It seems like a great concept, but I seriously doubt it will save 25% bandwidth. I don't think that that many users will send BTC from many wallets to one because there is almost no benefit to having only one wallet, more wallets help keeping your wealth and your transactions secret.
I also don't think it will help solve transaction spam, because it is still voluntary. Spamming for crypto-political reasons or just to increase tx-fees is still possible.
I hope you can prove me wrong on these points, because I always like to hear about new improvements to the Bitcoin system. :)
Yes I believe it is only for big companies, exchanges etc.. . But it might still be a big part of the global bandwidth..