He still did manage to secure a good bit of money for his family in the end, which was his original goal in the first place, so it wasn’t a total L
He got his brother in law whose the only other male figure in his kids lives killed
Got himself killed
Destroyed their families reputation
His kids have to be raised orphans and treated as the seeds of a murderer and drug dealer so those few million bucks isn't leaving them in a better condition than if he didn't start selling drugs in the first place
If Walt does nothing, fights cancer for a few years and dies, his family would have been in much better condition.