I think season 4 ends with Hank finding out Walt is Heisenberg
I don't think the show could go on with either Walt or Jesse dead. If you kill either (and Jesse is more likely to be offed than Walt), it would have to be in the endgame, within the last few episodes of the final season. I think if you kill either before then, you don't have a show anymore. That's arguable for Jesse, but definite for Walt.
Agreed. I don't see both Walt and Jesse surviving the whole show. Seems to me like Walt will be the one who dies (series finale in all likelihood). Maybe the cancer kills him (it would almost be a shocker at this point since we haven't heard much about the cancer since Season 2), or maybe Walt dies at Jesse's hands? Or if not as Jesse's hands, then Jesse gets the series' last moment/scene (assuming he's still alive). It would be crazy for both to die, but also realistic given their situation. We'll just have to wait and see.
It's hard to see right now, but I still have a feeling that, when it's all said and done, the overall arcs for the show will be Walt's journey to damnation juxtaposed with Jesse's journey to redemption. Jesse has been through his fair share of dark periods, and at a glance is much worse off now than when he started. But he's gained skills - first in chemistry and meth cooking, now in enforcing - and has found reserves of courage, intelligence and determination that no one knew he had, and he probably would never have discovered if he'd just remained a low-level meth dealer. He's found a place in the world, as horrible as that place might be. I think he has more of a future in this business than Walt does, particularly with the self-destructive bent Walt is currently on.

Aaron Paul is a magical entity who happens to act in his free time. Amazing.
the entire time. I was thinking in my head, "Here comes Emmy #2."
t:That whole scene at the end with Hank was awesome.
Remarkably well acted.That whole scene at the end with Hank was awesome.
that goes against everything walt stands for. walt will die in infamy before striking a deal.And I love seeing Hank back and better than ever. I figured they would have Hank vs Walt next year. But now I have a feeling now that Walt will tell Hank everything and maybe work out a deal with the DEA to help take down Gus and his whole operation. probably not. But I love how this show just keeps you on the edge of your seat every week.
I keep on saying this, but this week might just have been the best episode of the season yet. Amazing stuff.
Based on this episode alone, Aaron Paul has earned another Emmy. Hell, based on the pre-credits sequence alone (where he never even says a word), you could make a case for him winning the Emmy. The pain he had in his eyes at several key moments in the episode, along with that amazing "problem dog" speech at the meeting.... Bryan Cranston deservedly gets a ton of credit for his amazing performance as Walt, but Aaron Paul is right up there with him.
As Walt becomes increasingly rephrensible (I was utterly disgusted by him trying to talk Jesse into killing Gus - think about how difficult it was for him to make Jesse kill Gale last season, now he's happy to exploit Jesse's loyalty), Jesse is the person more and more who has my sympathy. This has been a masterstroke on the part of the writers. Think of how invested we were in Walt's well-being in earlier seasons. Now, I'd happily watch him crash and burn, and he'd deserve it, and my worry is more about all the other people he'd inevitably drag down with him. It's now Jesse who I am willing to get through this all okay.
And how great was Hank this week? I got a thrill watching him progress from wheelchair, to walker, to walking stick - he's getting back on his feet! THAT thrilled me, so then I ended up being totally blown away with him channelling his inner Columbo in the closing scene. By the time he'd laid out his case, my mouth was literally hanging open. Dean Norris has been the unsung hero of this show for a few seasons now. Really, it's almost a shame Aaron Paul is so damn good, because otherwise Dean Norris would surely be a front-runner for a Best Supporting Actor nomination.
I love this show, so much. I never thought there'd be a show to fill the gaping void left by that black year when both The Shield and The Wire came to an end, but every new episode of Breaking Bad is like a gift, and I watch every episode in awe willing it not to end. And the best thing about the show is it's so damn unpredictable. We're all speculating on where this could go next, and there's a load of very different scenarios that are all plausible. It could go anywhere.