The CW announced series cancellations and pickups today.
They responded to the negative reviews of Bloodlines and announced they are not going to pick it up.
From Entertainment WeeklyThe Supernatural spin-off. Tribes, or Bloodlines, or whatever the title — it’s dead. The Supernatural project was one of the highest-profile pilots this year, spun off from The CW’s 9-year-old veteran Supernatural, with a pilot that went on the air this season. So initially, Bloodlines (which changed its name from Tribes) was considered very likely to move forward, yet fan reaction to the pilot was largely negative — EW’s own informal poll showed only a third of viewers thought it was worth continuing. Sources say The CW is leaving open the possibility of spinning off Supernatural in another concept down the line.
I would watch a spinoff. In fact I was going to give Bloodlines a try if it had been picked up. But I think there are better concepts out there.