Not to be a downer but this isn't necessarily true though. If your opponent's network to the dedicated server is much slower than yours (to the server), it's still likely the slower one is going to be the bottleneck.
I transfer a large amount of files between computers all the time, and in general, P2P is still much faster than having another server in between.
I'm curious what aspect of online gaming is going to be improved by the new scheme though.