Google Search: How high can market share grow?

How high can Google Search share go?

The January 2007 search engine share stats are in. 

Top Search Providers, Ranked by Searches (U.S.), Nielsen/NetRatings:
                               
Google Search: 53.7%
Yahoo! Search: 22.7%
MSN/Windows Live Search: 8.9%
AOL Search: 5.4%
Ask.com Search: 1.8%
[poll id=66]

ALSO: Google: Hollywood vs. YouTube video games