Hands up who didn't see this coming! http://www.digitalspy.com/tv/ustv/news/a856604/bryan-fuller-exits-the-vampire-chronicles-tv-series/
At some point, a studio is going to look at the unfinished and abandoned projects he's left behind and say, "Look, Bryan, what have you done recently?"
And his two most successful shows were canceled prematurely (from what I gathered with Hannibal, I haven't actually watched it). Yeah, this doesn't look good at all.
Since the reason he left "American Gods" was that he felt a $10 million per episode budget wasn't high enough, can you blame them? yes, you want a good show, but said show also needs to have a good ROI/profit. The man clearly has lost it.