Aaron Rodgers & Russell Wilson might disagree with that.
Yeah they've always been happy with him, but things don't tend to change very much.
And I'm not hugely familiar with what he's done with his back but if it's disk related then it's basically like driving without car insurance.
So yeah, he might have that amount left in him but we need to start looking at someone else either for his slowing down or injurywise.
Rodgers was drafted in 2005 and the Packers had time to groom him before he become their starter four years later. Times have changed since then and teams just aren't keen can't to do that today. You draft a quarterback high in the draft he is expected to the starter in his first season or at worst his second.
As for Wilson, well Seattle was in need of a quarterback when they drafted him in 2012. They didn't spend time grooming him either as he was their starter that season.
I think it's one of the problems teams have when they draft a quarterback in the first round or even in the early rounds, they put too much pressure on him.
As for looking for Romos successor well that could happen as early as next years draft. Really will depend on how his body stands up this season. If the Cowboys have doubts about him for 2016 then I suspect they will go shopping for a new quarterback.