Dolphinsea, I had a similar idea once. perhaps for a good sequel they could do a spin off of what if Kiara had not been born but instead Kopa, like in the books. just showing a different sequel version that would hopefully explain lots of things and not have the many plot holes of SP.
but most likely there won't be another movie. have you ever noticed that on TLK2:SP, it says The End? not all that major, but the other movies never did that. so maybe it is the end.
if they do make another movie, I'd like to see the split version I mentioned above or a prequel going into Mufasa and Taka.