Arent you all severely underestimating hashirama? Obito is strong, but the juubi hes a host to doesnt have the 2 strongest bijjus in it. Thats still miles away from the real sage of the 6 paths, who had the full juubi and was still conscious. Hashirama, being the younger son descendant, has half of the rikudos power. What the kyuubi chakra will do for him is to increase his strength by about 4 times( if he gets a fair amount). Imagine a flower tree world x4, or a myoujinmon x4. Moreover, the hashirama that obito smashed was just a clone, just look at it, it was covered in wood. My guess is naruto will tilt the balance, how he does it is the only question.