I think it wrapped of the pieces. It wasn’t a show for surprises. And really what surprises would there have been? Walt get cured and lives? The family finds the money and figures out how to launder it themselves? Jesse goes Rambo and frees himself and takes over the business? While it wasn’t necessarily the ending they had in mind from the beginning (other than Walt dying, Vince always knew Walt had to die, he believes in hell and punishment) it was the ending they had built to without necessarily knowing.
“And really what surprises would there have been?”
Walt shot by his own son. Would that have surprised you?
Jesse hanging himself to stop from being forced to cook. That would have been surprising.