I've been thinking that the whole Saul spin-off thing could be bulltrout and an attempt to conceal the fact that Saul will end up dead by the end of it.

And honestly, I'm not too keen on that idea as a whole. Saul is one of my favorite characters in the show, but he shines when he's shown like once every episode or two. He's a great supporting character, and integral to the plot of Breaking Bad, but I don't think an entire show based around him would be all that good.