Or even better - Walt goes on witness protection. Beats Hank to the punch making Hank look like he covered up Walt's actions. I mean, Walt's drug money did pay for the now functional legs Hank is carrying around.
Walt goes straight to the DEA headquarters and says, "I can give you an international drug trade, and I can make it look like a small DEA office in booney fuckville New Mexico is a force for all international drug trades to reckon with."
The Albuquerque DEA splooges in their pants right there, and Walt grins while wearing his hat. He realizes that now Heisenberg's role in life is finished. He as Walter White will accept their witness protection program and move to New Hampshire. There he will try to find solace in running a bakery where he can do chemistry all day long.
Skyler however is angry and pissed that Walt turned on Hank and got Hank fired from his job. Hank has a heart attack due to the rage he feels and Skyler and Marie move in together to take care of Holly while Walt Jr goes to college.
Even though Walt's family is gone, he is safe. They are safe. The drug organization was stopped. Jesse either gets better or commits suicide, but either way, Jesse is out of Walt's life.
But it doesn't end there. No, no.
There's one caveat. Mike.
Mike didn't die. In season 5, there were multiple references to good Samaritans. One was when the dump truck was "broken down" on the tracks during the train robbery episode. A good Samaritan Native American drives up to help. When Walt brought Jesse the money, he referred to a time when the RV broke down and Jesse had to walk to get gas. He said, "I prayed that the cops wouldn't show up or a good Samaritan."
Mike slouched over due to blood loss and apathy because he was dying knowing his 9 guys and 1 lawyer were dead, Walt had just shot him, and worst of all, Kaylee was out of money. After he fell, Walt left. But before Mike slipped away into the neverlands, a good Samaritan comes up. Gets Mike to a hospital. Saves his life.
Which also referencing tonight's episode is plausible. Walt promised Jesse that Mike was still alive.
So Mike heals up. Shit goes down with Walt, the DEA, and the international drug ring. Once it quiets down, once Skyler and Marie move in together, that's when Mike makes his move.
He shoots Skyler, Marie, Walt Jr, and Holly. Leaves them dead. Leaves some kind of token or note that lets Walt know that it was him. Walt comes back to New Mexico and purchases a machine gun.
He's going to kill Mike to end the show.
**None of this will happen because Walt is recognized as Heisenberg. It's spray painted in his house. His neighbor showed genuine fear at the sight of him. Also, a Mike-Walt showdown to end the show would be lame. Maybe someone else though?