This is a follow up from the same folks that brought us the Google Loves Weblogs story I linked to yesterday.

Google Time Bomb - Will Weblogs blow up the world's favorite search engine?

If weblogs really take off... I mean, 1,000x more weblogs than there are now in 5 years, this effect will be flattened. The issue is, right now, weblogs are a small group, tight knit and self-referential, and just large enough to be statistically significant in Google's eyes.

I wouldn't worry about it long term.