Sasuke would still beat him.
-Ameno w/ Bijuu PS blitzes and one shots him. Hashirama can react to Sasuke using Ameno, but he won't react to Bijuu PS using Ameno when Naruto himself got blitzed by this, and since Shinsuusenju doesn't protect him all around like Naruto's Avatar does, he dies.
-Indra's Arrow still one shots him. There's no concrete proof that even w/ the Nature Energy, Hashirama would be able to reproduce an attack that is strong enough to match Indra's Arrow. What's worse is that Naruto's attack had the elemental advantage, so generic downscaling isn't even going to help here, because Hashirama lacks Fuuton, thus lacks the elemental advantage. Another thing is, he has no energy based attacks, only physical attacks via Shinsuusenju, so he'd have to try and match Indra's Arrow by punching at it, and since he has no attack that matches it in raw power, it'd pierce right through and wipe him from the face of the planet.
Hashirama gets spanked by Madara too if he can't really take in all that Nature Energy, even if he can he still might lose.
-Anything bar Shinsuusenju is useless against Perfect Susanoo.
-Even if he used Shinsuusenju, Chibaku Tensei downpour would obliterate it since Hashirama can't even attack the rocks without waiting for them to get close, and if he did that, then he'd only be able to attack one rock and not the other dozen coming at him. He won't tank it, nor will he survive it. So that's the end of it. Not to mention Hashirama can't handle the downpour and handle Madara's Susanoo at the same time.
Not to mention Dual Rinnegan Madara>>SM Hashirama. Give Madara Juubi and give Hashirama half of Hagoromo's chakra and that gap remains the same.
If Hashiram becomes Rikudou, doesnt that make all his Mokuton "
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"?
Nope. Madara can use Shin Mokuton because Shin Mokuton is just him manipulating the roots of the Shinju, which is extremely large. Doubt a Rikudo boost will put his Mokuton on a worldwide scale.