The latest band-aid solution for the increase bandwidth taken with syndication feeds seems to be mod_speedyfeed. Although a Atom-only solution, I’m sure someone will adapt it to RSS in no time. Client-side support will follow, I suppose.
Yet, it still is another attempt to improve a broken model and ignore the real problem (syndication is still pooling), and this keeps us from having a decent solution (IMHO pubsub of some sort, with near-by nodes).
I wonder when we will see a global pubsub solution that scales, with multicast distribution of changed feeds to interested nodes.