buckshot said:
I can't imagine Walt would want her back. If I remember correctly she started cheating before she ever knew about the meth so hopefully somehow she won't get any money in the end. I also think that the cancer will come back and that's what will get Walt.
Skylar is almost like a type of cancer to Walt now and vice-versa. She's taken away everything he holds dearly and has openly expressed her wish for him to die off to ensure the children's safety. I think it all determines on which character cracks first. Walt perhaps stooping to a new low (Lets face it he's experienced his fair share of low points in order to achieve what he wants) and killing her off or Skylar admitting to Marie about Walt's secret as he's transformed into such a monster he's unrecognizable as the man she married.
Needless to say, the cancer coming back and that finishing him off would be quite an underwhelming conclusion to such an amazing series.