Well if they made a sequel to SP, then Simba would be getting rather old. I don't think Kiara would play a very big part, Kovu would take most of the typical Simba lines, and Simba would say something wise and soppy at the end to make him seem like Mufasa. Plus, who knows what kind of plot it would have.

But yeah, while a prequel does sound kind of cool, I think its nice to leave a little to the imagination.

In Short: No.