To be honest, if there's one plot element here I'm not really sure is a logical development, Walt and Gus' relationship disintegrated largely because of disagreements over Jesse, so now Gus is going to off Walt and...replace him with Jesse, the guy who was the problem to begin with.
Walt and Gus' relationship disintegrated because Walt got Jesse to kill Gale. He realized this was because Walt was concerned about being replaced, so what better way to deal with the situation than to make Jesse the potential replacement? With as many times as Walt went out on a limb for Jesse, Gus knew Walt wouldn't just kill him, and if Gus could make Jesse loyal to him rather than Walt, it makes it really easy to get rid of perpetual troublemaker Walt, still get his meth made, and have Jesse groomed as a future Mike.
If Gus' efforts to rehabilitate Jesse failed to bear fruit, Gus could've easily had him killed.
Not to mention, the cameras and Tyrus' presence provide an extra insurance policy so that Gus could likely still cook even if both Walt and Jesse were out of the picture. But why get rid of Jesse if he's still useful? Walt turned out to be the real threat to Gus' operation.