I still think Walter foiling himself would be better poetic justice than having Jesse off him. If they had wanted to play that card, they should have addressed it earlier somehow. And at this point, bringing the old Broc thing into the mix would be a little too farfetched given how efficiently Walter disposed of that evidence. I will grant you that whatever ending they choose should be exciting as hell and awesome, but Breaking Bad has made a habit of doing what makes sense rather than doing what people want. I would like to see the writers and producers continue this trend to the end.