Keep the save. I kept a save before the Landsmeet, after the Landsmeet but before the final fight and one after the fight but before I talked to any of the companions.
Future expansions and DLC's will be available from an endgame save, so keep it around and go from there when the game grows. Bioware has planned out two years worth of extra content and expansions, which they will inevitably draw out needlessly. For profit.
Other than that... play again with a new character? Go outside?