I don't think a Fring spinoff would work and I question whether there would even be enough story to tell. We pretty much know everything there is to know about Gus/are going to learn more about his pre-BB days throughout the rest of BCS.
I also don't know what a post-BB Jesse spinoff would look like. I kind of just like to imagine that he got his life together and is doing good.
Now, a Jr. spinoff? Count me in.
http://weknowmemes.com/wp-content/up...ing-around.jpg