According to narutopedia (I know sometimes it lies) the rasenshuriken creates countless microscopic wind-blades that damage the body on a cellular level. It produces so many individual strikes that even Kakashi Hatake is unable to count them all with his Sharingan. The wind blades sever nerve channels in the body, leaving the target unable to move after being struck. They also attack the chakra circulatory system, which cannot be repaired by any form of medical ninjutsu. Depending on the severity of the damage, the user may not be able to perform a technique ever again. Because the Rasenshuriken does cellular damage to Naruto's arm when he first uses the technique without throwing it, Tsunade labelled it a kinjutsu and likens the technique's effects to poison.
Now we have seen sasuke's susanoo get cracked open by danzo, demonstrating that with enough force you can break a hole in it. SO if sasuke was to get hit by a rasenshuriken, would the continous microscopic attacks eventually destroy it and then take out sasuke? The rasenshuriken seems to stay around for a while, it hits, and then expands all the while doing massive damage so I dont think time would really be a factor. If nothing else could it eliminate susanoo giving naruto an opening ?
Now we have seen sasuke's susanoo get cracked open by danzo, demonstrating that with enough force you can break a hole in it. SO if sasuke was to get hit by a rasenshuriken, would the continous microscopic attacks eventually destroy it and then take out sasuke? The rasenshuriken seems to stay around for a while, it hits, and then expands all the while doing massive damage so I dont think time would really be a factor. If nothing else could it eliminate susanoo giving naruto an opening ?