Just thought of this...
Going back to the episodes where Walt and Jesse teamed up with the Nazis originally, to start the Vamanos Pest operation, they were originally thieves. Then they all made the deal not to steal anything else from there on out. They were to take orders from Walt and Jesse and to only take "their share."
Now the went ahead and said f-ck you to all of that and in the end: were thieves.
Yeah, I was thinking about something similar yesterday. I was going to make some sort of wise crack about how if they just listened to Saul and chose the Laser Tag store as their front, and minded their own business back by the pinball machines, then they wouldn't be in any of this mess right now. During the train robbery, they could have had Huell driving the truck and Bill Burr helping with the water hose. Drew Sharp would have lived and said nothing. Jesse wouldn't go into a walking coma.
What would NOT change is that Mike's guys are still in jail, their hazard pay is still getting seized, and Walt is going to want them dead. Of course, without Todd he doesn't have Jack, and thus no resources for pulling off the assassinations. But, I imagine he would have figured something out because getting caught certainly wasn't an option for him. And, thanks to his greed and pride, neither was quitting.
No matter which way you slice it ... the downfall is/was inevitable.