Engadget writes Warner's decision to go Blu-ray had a devastating impact on the sales of HD DVD players. In the first week of January sales of HD DVD players accounted for 48.83% of the HD market but in the second week of this month it dropped to a measly 7.47%:
According to the latest NPD group report, during the month of December Blu-ray players held 60 percent of the HD media player market -- despite the fact that HD DVD players were considerably cheaper. While that might've helped Warner in its decision to go Blu, the move has definitely had a dramatic effect on player sales since. According to the same study the week after the announcement, Blu-ray players were able to grab 93 percent of the market, which puts the year to date (short, we know) share for Blu-ray players at 70 percent.