This idea strikes me as a classic hacker's toy: technically good, but not sold well at all to the average consumer (aka "the world").
Why not repackage it as a way to find out when and how your favorite sites update? Like a really simplified RSS reader (either a desktop app or web app) that uses the current technology to let you know when things have changed on arbitrary websites. I could see a lot of people being interested in something like that who have no clue what RSS is.
It's not about updation date. It's about content. The RSS generator will "scrape" indexable content, viz HTML. It cannot read Flash content (because its embedded in a non-standard format), just like a search engine bot (Google) can't.
Why not repackage it as a way to find out when and how your favorite sites update? Like a really simplified RSS reader (either a desktop app or web app) that uses the current technology to let you know when things have changed on arbitrary websites. I could see a lot of people being interested in something like that who have no clue what RSS is.