A Feed of Feeds
As the number of blogs and other feeds increases towards infinity, I predict that the concept of a "feed of feeds" will emerge.
The model comes from the world of financial services, where funds of funds select an a group of funds for investors. While a feed of feed doesn't provide the same financial diversification, I think it will help readers better manage their burgeoning blogrolls.
The fact is that not everyone has the time to manage their collection of feeds. Just yesterday, a friend of mine in the tech biz asked me what a BitTorrent was, and why he hadn't heard of it before. While I gave him a few pointers, wouldn't he have been better off receiving a pre-packaged set of "What's Hot" feeds?
Blogs are messy things, and for right now, human editorial selection adds a lot of value.