Triforce, you have an awesome signature. o_o Really. Listening to the tune of the Ocarina really makes me want to go back and play it. Ha, but that won't be before februari. >_o
Anyways.
I would have loved to spend time seeing Hyrule as it was freed from darkness in some games. Not in Ocarina of Time, since it had a nice ending. To continue playing would kinda ruin the feeling I had when I watched the credits roll.
But as Triforce said, it would have been perfectly possible to allow the player to wander in Hyrule Castle after it had been released from Vaati's grasp.
You could perhaps even do sidequest with helping the town rebuilding.
And now that I think about it... as Jolene stated earlier, most Zelda games move on after the Final Boss' fight. The player just can't be a part of it anymore.
It's sad, but I think it's also a part of the series charm. The Legend doesn't end after the game... It's up to the player to imagine the continuation (until a new game comes out).