but you can use silverlight just fine on linux (well not official silverlight but from my experience it works just as good) http://www.go-mono.com/moonlight/
Not until netflix changes their encoding scheme, or microsoft gets with the program and writes more unix software. netflix relies on silverlight technology, developed by the big M.
It is possible, like on the WesternDigital Live boxes, to write a secure app for netflix for specific unix distros. Yes I can see it coming to this distribution. But generically speaking, its unlikley netflix will be supported in unix, kinda like BluRay or DVD. (of course anythings possible with work-arounds/emulators/hackery, like DeCSS)
so that should be a non issue i would think. official silverlight support would be nice but in the meantime this works just fine