Do JavaSctipt and Google Chrome pose a threat to Silverlight?

ZDNet Australia has a piece on the Google and Mozilla implementations of JavaScript and it’s potential effect on Silverlight

I think that the next 18 months we’re going to see a 100 to 1,000 fold speed increase in JavaScript as Google and the guys at Mozilla are going to kick us all in the arse and make our JavaScript jittered

Scott Hanselman speaking at Tech.Ed