According to Gartner's report, Hype Cycle for Emerging Technologies, RSS will be useful for content that is 'nice to know' rather than 'need to know' (via Silicon Republic).

The report is described as an IT buzzword hype scorecard
which assesses the maturity, impact and adoption speed of 44 technologies and trends over the coming decade, including Location-aware applications, RFID, SOA, Web Services Enabled Business Models (new one on me, but nice buzzword - maybe 'API business'?), Wikis, Podcasting and P2P.

Quick rant
(I confess: I've not read the report yet, so am going by the press release and soundbyte):

I think Gartner's RSS conclusion is dead wrong, as their conclusion
- that RSS will be not be useful for critical content - can only be arrived at if one makes a significant and wrong assumption about RSS to begin with.

The wrong assumption is that RSS must be the end-to-end (or at the very end of) the content delivery format/process of business-critical content/information - and the implication is that a feed aggregator/reader/viewer/client is the end-destination for x-critical content.  This implication therefore pits RSS against email or other tried and tested messaging/transport technologies. 
They fail to recognize the simple fact
that RSS content can be transported (reliably and pinged as often a necessary - this is a software issue not an RSS issue!), consumed and transformed by anything for anything: from RSS xml TO an email message, from RSS xml TO sms alerts, and visa versa.  Major oversight, me thinks.