Netflix on the Xbox 360 has been a huge success – Everyone I know who uses it (me included) absolutely loves it. While it would be in MSFT's interest to keep the ability to stream Netflix's 'watch instantly' flicks exclusive to their console, it's in Netflix's interest to make their movies viewable to as many people as possible.
Which is probably why many people have reported getting emails asking if they would consider paying a one-time $9.99 charge to 'activate' streaming on their PS3 or Wii – plus Netflix membership fees of course.
If I didn't have an Xbox with a gold Xbox Live membership (required for Netflix viewing), I would definitely pay 10 bucks for the ability to stream Netflix.
Would you?