If I read correctly Ashley's link, the news about dropping silverlight is half a good news.
Indeed, they are dropping it, apparently, in favor of another microsoft proprietary stuff "Windows RT", not to the profit of WebGL for example.
The really good news would have been a single standard (webGL, OGG support... meh, sweet dreams, but not yet). Apparently, they are still not up to it.
As far as flash for desktop, I have a friend who work in research and told me flash won't die that easily (on server side for example).
Anyway, it is nice to see that HTML5 IS recognized. That seems to prove that it was the correct bet.