Naruto can use this technique now...?
The Nine Tails rejected Fukasaku because it wanted Naruto to use its chakra. With its chakra gone, won't it allow Fukasaku to fuse with Naruto now as there is no point in rejecting him. Even if the the Nine Tails rejected ukasaku out of spite, this technique causes Naruto so much less of a hassle getting sage chakra, it increases is chances of survival, so the Nine Tails' survival chances are enhanced at the same time.
Maybe we should add this to the article, Thanks a lot and please respond to this topic!