I don't know, but mobile only represents about 3% of web traffic.
http://www.quirksmode.org/blog/archives/2011/01/2010_mobile_bro.html http://www.quirksmode.org/blog/archives/2011/01/2010_mobile_...
With time. The point is that both HTML5 <video> and mobile web are in their infancy. Browser desktop share is now and it seems foolish to ignore 20% of the market in favor of a segment that accounts for 3% of traffic.