link-based search question

[Chndru]

But the Web is inexorably dynamic. During the next five years, it will move from containing primarily file-based content (HTML pages) to containing more executable content (e.g., online gaming or new structure imposed by Web services like XML). When that happens, the usefulness of link-based search will wane.

from: [alwayson-network.com...]

I am not quite satisfied with the explanation given. Can anyone explain why link-based searches wont be effective?

Thanks

[transactiongeek]

Executable content is difficult to parse by engines.

What they say is extremely unlikely. Content is getting simpler not more complex for the very reason that people want to be found.