Not seeing it... their big issues along those lines are the copyright holders' restrictions on where media can be played. I don't see any real benefit for them in accepting them. Plus, with Bitcoin, they have no good way to auto-debit your monthly fee. Maybe if they moved much further in the direction of producing their own content...

On the other hand, Youtube has been rumored to be thinking of creating subscription channels. Accepting Bitcoin could be a significant help for them if they did, since it would allow them to charge subscribers and pay producers in any country with minimal hassle.