I would stop at that time then. The XIII series is one of my favorites, but LR went too far, actually XIII-2 wasn't needed at all. But XIII-4 and XIII-5 is where I draw the line. If Square Enix announced this, then I can sympathize with the XIII haters.
I would j*** in my pants. I want as much more XIII series as they're willing to give.
In fact, I'd kill for a Lightning returns for the rest of the cast. Most of all I want to play as Hope, but I'd like to play as everyone. A Final Fantasy XIII Conclusion game, with everyone playing part, and establishing lives in the new world that is sure to come of this game's conclusion would be fabulous IMO.
Mai waifu: http://img62.imageshack.us/img62/3729/maiwaifu.png