What do you think of the future of the franchise?

Before watching the movie I thought for sure this one would wrap up the trilogy. I had heard there would be a reboot after Man of Steel and that there would eventually be a Justice League movie to try to rival the Avengers.

But after watching the movie, it seems to me that they have clearly left the window wide open for additional installments. The end of the movie went out of it's way, in my view, to prepare us for future movies. Why wait until the end of the movie to inform us that the policeman was Robin and then set him up in a new bat cave? Is it possible that they try to do a Nightwing/Robin standalone movie?