November last year, on the FoRK mailing list, I declared that "Eclipse is the new Emacs" and predicted that "by 2005, there will be people that never leave Eclipse to do their work."
Since then I've been toying with the idea of a full-blown PIM based on Eclipse: email, rss aggregation, calendar, todo and maybe even instant messaging. The nature of Eclipse is such that these not need all come from the same developers.
I think my prediction is definitely shaping up to come true and it's quite possible I'll be one of those people.
UPDATE (2004/05/06): More evidence: Buying from Amazon within Eclipse