Oh good..I like the concept of a self-contained tv series. CBS is attempting the same thing with Hostages. Although we can thank Ryan Murphy/Brad Falchuck and F/X for coming up with the idea - in American Horror Story.

Personally I think the OUAT universe is a perfect platform for launching these self-contained tales. You can also ...after the series concludes, allow the characters to pop up on the original series in cameos.

I love OUAT...most innovative thing I've seen on TV in years.