I think Microsoft should put some more effort into the UI of vista rather than develop support for blu ray.
Blu-Ray technology is a fad, desired only by those with money to burn. It did not achieve the wow factor it was looking for.
Maybe i am just biased but i don't see much benefit of watching Blu-Ray DVD's over normal mpeg-2 DVD's.
Although, there is much speculation over whether blu-ray disc sales will outnumber HD-Disc sales in America, as can be seen here: