Husband turns drug kingpin just to pay for his treatment and provide for his family is an insane idea, and shouldn't ever need to be considered.

it was never about this. Walt did it all for himself, for his ego. Walt was cornered into a mundane life by choices he believed he had no choice in making. his cancer diagnosis triggered something inside him that made him realize the illusion of control he thought he had was simply a cage that held his ambition hostage.

Walt was always the "drug kingpin" he just needed to be reminded of that through his own mortality.

as for his pride, Skylar took that from him, though he willingly gave it away she never allowed him to gain it back and discouraged him because she was afraid he would succeed.

it's a perfect example of everyone being shitty and the only true victim was his son.