He'll probably be unable to control it ?
Or Obito will do something crazy.
Or Ramen guy will come and save the day.
Madara will use Obito as intended. Madara will try and become the Juubi's host, Naruto will stop him. Kakashi will persevere and make it back to see Obito die. The 4 Hokage will take on the Juubi. Naruto and Sasuke will fight Madara. The Gokage will make it back in time to witness the awesomeness. And the all lived happily ever after, in 3 sentences... Whew.
Gokage?? You mean Goku+hokages?? LOL