After the events of buyout and say my name, I think when Jesse learns what Walt did he will be pushed far enough to be willing to kill Walt. Walt has no qualms with murder, he has made this more than clear time and again, and he leaves a trail of destruction in the wake of his actions.
For as little time as that might be, considering it looked like his cancer had returned.
Oh I know Walt can and will kill and has zero morals about murder, look how he handled the dirt bike kid, but he doesn't need an M60 and hundreds of rounds of ammo for Jesse. No, if he were to kill Jesse, it would not be with a machine gun. Jesse would murder Walt for what he did to his girlfriends son, no doubt. But, Walt still wouldn't need an M60 to take on Jesse. So the M60 isn't for Jesse as far as I can figure.
So, my theory is that Walt's new connections get in his way of his desire to be the main and only meth lord around, and he goes to war with them like he did Fring. I do see Jesse coming out of all of this clean. Hell, he may rise from the ashes of Walt's epic meltdown and become the new meth lord. He has the skills and the equipment.
From what I can gather, Walt goes after Mikes people in prison. Those guys will turn now that the money is gone. Walt will have to go after them. Maybe he will use Lydia and the list of names she has. After all, she put out hits on them and failed. Walt can get it done now. So that cleans up any past connections and can cut of the trail the DEA is following.
As for Walt having cancer again, that is a possibility, but with only a few episodes left, I don't think there is enough time to let that be a factor in how it all ends. Plus, that is too easy for the writers to fall back on. I give them far more credit than that. Walt's cancer shouldn't be a factor, it doesn't have enough time to play out.
Either way, this show is non stop awesome and leaves so many openings to so many possibilities that it is really anyone's guess as to how all this pans out. Can't wait to see!