dont make me remember the rinnegan. why doesnt obito just send out one giant whirl/wave/orb burst of Nagato´s "death aura dragon"-jutsu, killing everyone at once without any means of defending against it.
The rinnegan is one of the worst elements ever introduced to the series, as Kishimoto never thought it through.

and i definitely hope that oro returns to play a big role at the end. though my hopes for that shrink with every chapter of dragonball-esque battles.

random prediction/wishful thinking: Sasuke is hit by a deadly attack, sure to die, when Oro finally takes over Sasuke´s body, regenerating the physical condition, but leaving Sasuke´s mind in the realms of death. Resulting in Sasuke being there as an outer appearance, but it being Orochimaru in reality. Who can now fight with his full potential, now that he got the body he always wanted. Ends with Orochimaru becoming Hokage within Sasuke´s body.