I don't see the advantage of ownership for Microsoft. A significant strategic investment, sure. Netflix is a pretty effective standalone entity, and if they are going to Silverlight, that's the big Microsoft win. Traffic to Netflix is not likely to be convertable -- I go to the site to adjust my queue or watch something, and advertising or cross promotions would be an unwelcome mix.
I agree with the article, it would be a good move for Microsoft overall...however, I'm not sure how happy the userbase would be if any the comments to the article are to be any representation. I don't understand why some people are so hardcore "if Microsoft touches it, I don't want it!"