I for one am thankful that Netflix uses Silverlight. For one thing, it doesn't seem plagued with 0-day exploits all the time, doesn't want to update itself every other day, and crashes a hell of a lot less on my Mac than Flash does.
Silverlight is what crashes for me on the PC, while watching Netflix. I never have trouble with Flash, on PC or Linux. Except that it steals the mouse and keyboard. I hate that.
I'd be ok if MSFT won this one.