OK I would like to say that Kingdom Hearts 3 would be completely epic, but it is not a guaranteed thing to make another Kingdom Hearts game after the Xehanort Saga, in an Interview with Nomura, it said this.
In another interview you said the reason why it's shocking to other people is because they don't know the path that you've created and you know where it's going to end, so you know how to get there. How far have you created that path? This is supposed to be the end of Sora's story. Do you have another story that goes beyond this or is this the end for you as well?
The way that I make games is that while I'm creating the current title, I'm always thinking about what's ahead of that. That hasn't changed from [the first] Kingdom Hearts, so it's the same for Kingdom Hearts 3 as well and it's all in my mind. But that doesn't mean that we will be able to create that game or we will eventually create the next game. I do this so that it doesn't contradict what I see in the future of Kingdom Hearts. Like I said earlier, it's just not that it's a definite yes or no as to whether or not there will be [another Kingdom Hearts] title, but I do have something in mind.
So we will never know until the future if Nomura is going to create another Kingdom Hearts saga, or he will close the franchise entirely.