Personally, I think there are a couple of other issues hampering
aggregator adoption (if anything is hampering it, and I'm not sure).
One
is terminology. You say news feed, and I might think USENET. You say
news aggregator, and as a normal user I might have no idea what you're
talking about. And RSS is probably a meaningless acronym for most
people. So terminology is confusing. Second is education. I bet the
vast
majority of people who could benefit from using an aggregator have no
idea that they exist and don't fathom how they operate.