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.
But he's able to put people's skills to work and manipulate them into doing what he wants, and to that extent Jesse remains useful to him--for the moment. Obviously, he doesn't want to put himself in a position where all his eggs are still in the same basket, so he'll want to get another chemist (or two) on board as soon as possible. Maybe Jesse is just a stopgap to him and he intends to off Jesse and Walt as soon as it's convenient. 
I was breathless during those final moments and when the episode ended I started coughing from the intensity of it all. This show causes the weirdest reactions in me.
. Saul is getting out of town as soon as he can, knowing that the shit is going to hit the fan in a big way. The dangers of Walt's criminal life are hitting close to home in a way it never has before. I'm angry at Walt Jr. for giving his mother crap about not convincing Walt enough to join the rest of the family but it would seem that way from his perspective. It also looks like Skylar really does give a damn about Walt despite the crap that has happened in the past. Once again, Gus escapes from another attempt on his life by Walt but it is my hope that Gus's luck will run out in the season finale which I really wish will take place tomorrow instead of next Sunday.