Yeah my original guess at the end of S5 (which would have made a decent storyline) was for Walt to see his son using Meth (depressed cause of his condition, easy influenced by peers etc), decide to get out the game but then Hank finds out.
He’s then stuck between being Walt and taking the wrap to show his son the right way or going full Heisenburg. The s5 cliff hanger woulda been him with the M6 in the boot (showing hes gone full Hiesenburg) and the ending 6eps being him killing Hank then Skylar or Jesse offing him.
^ everything Walt has done was to protect and ensure survival for his family. Hiesenburg only came out once shit got real… He kinda deveolped a taste for authority being as though he was a dweeb and peon all his life. Slowly the role of family protector shifted and Walt got caught up. But Skyler and his kids still add some kinda balance. End of the day the nigga dying for his.