User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/Hurry Up Spin-off!!!/@comment-5674726-20130524001406

If the producers have plans for a spin-off, they'd want to get a move on.

Most of the spin-offs I've watched are shows that started while the parent show was still airing; Buffy/Angel, Hercules/Xena, Grey's Anatomy/Private Practice, Stargate: SG-1/Stargate: Atlantis.

There can be a fairly narrow window of opportunity to capitalise on the interest in the parent show to give the spin-off a viewer boost. Wait too long and people move on and won't be as interested as they might have been at an earlier point.