Hello,
I agree with your point. I can understand Tim Berners-Lee's pleading to make the web more structured, but I can't see why people would bother entering their data in a predetermined ontology-based format, unless search results deteriorate to such a degree that semantic-based systems outperform traditional ones, or that people/ institutions/ companies publishing their data in the semantic web get more hits and more visitors.
Maybe there is an analogy with the early days of HTML, and will browsers evolve to code data automatically into semantic web-format?
I quoted your argument on my blog (stefedu.blogspot.com), hope that's ok for you.
Stefaan