They can probably still stream that through the official website, or mike's blog or something. Warner can't control artists personal videos and stuff.
I also feel bad for all the remixers out there who get all their music heard on youtube, I've discovered tons of cool remixes for Linkin Park and many other artists and now all their songs are getting shut down. Imo listening to somebodies remix of a song on youtube is just as legal as listening to it in a club. Same goes for being able to rip it off youtube as well considering say you listened to it in a club you could just as easily record it... Warner is going to lose tons of money on this and down the biggest FREE video channel on the internet. They are even deleting the composition videos that people have of them doing something that just has a song in the background simply to set the mood of the video, whether it be car racing or just people doing stupid stuff... but I'm sure if youtube falls an even bigger and better video channel will rise to the occasion...