See this is where they shot themselves in the foot.
"Let's make a bunch of games around the same mythology!" they said. "We'll call it Fabula Nova Crystallis and name them all Final Fantasy XIII something!"
Cool, they think. We're onto something here. They plan XIII, Versus XIII and Agito XIII.
Then Agito gets renamed and Versus drops off the radar. Cue XIII-2.
If XIII-3 goes through, you're looking at FF Versus XIII, XIII, XIII-2, XIII-3 and Type-0. That is ridiculous. Especially if the others get sequels too. Can you imagine a Versus XIII-2? Good lord. GOOD LORD.
What they should do, and always do, is take a leaf out of FFIV's book. You want to make a sequel? Give it a smurfing subtitle. And if they're looking at making compilations/ using the same mythology for a group of games, do the same, or take a leaf out of The Ivalice Alliance - FFTactics (Advance(2)), FFXII, FF Revenant Wings.
I don't even remember my point or if what I'm saying makes any smurfing sense but they are idiots and should just finish making all the other games first.
(seriously I have no idea what my original point was)