Sasuke was knocked out for literally god knows how long right after the clash. Naruto wasn't completely immobile. He couldn't move very much for fear of bleeding to death, but since you want to split hairs in that time Sasuke was out cold, I'm sure turning over to stab him with a kunai, or hell even to hold his nose so he couldn't breathe, wouldn't have been too much movement for Naruto.
But in all seriousness, Sasuke lost the fight. There was always going to be a winner/loser because this fight had a deeper meaning than what was on the battlefield. If there wasn't a winner in this fight, then it would've made the entire thing, along with a great portion of the main story pointless.
Losing the fight doesn't mean he's necessarily weaker, but he lost. People just need to look beyond the fanboyism and see the significance of the loss for what it really is, just a plot device to bring it all full circle.