How Low Can MSFT's Marketshare Go?

The November numbers are out, and Microsoft's marketshare in search continues to sink.

November =7.1%
October = 7.4%
November last year = 9.8%

And it makes one wonder just how tiny their marketshare will get. Continuing to fall 2.7 points a year, we can project the intersection with 0% in June 2010.