You gotta have two quarterbacks in this league today. It seems like every week a couple of QB's are on concussion protocal.
If you have a servicable backup then you might me capable of playing close to the same level as a team if the other squads elevate the quality of play in order to compensate but very few teams in history were able to do that. That is why the circumstances this season surrounding Dak Prescott and Cowboys is so special.
But what if you have a really good backup? I mean a really really good one. Then the offense can attack as effectively as they always do, there is no dropoff, the team continues to be multi-dimensional.
When you look at the total combined salaries of Romo and Prescott you can see that the team is paying out what it expected, only the value of each contract is reversed in terms of starter and backup. So what? Having Romo on the bench with his contract is not a waste in terms of security, experience, mentoring and especially competition. Love what Dak is doing but this is a Janet Jackson league, meaning "What have you done for us lately"? With Romo around I doubt any starting QB would be comfortable enough to stop striving for improvement
Here is another thought:
Suppose the Cowboys were to devise a set of plays to be used by Tony on one drive per game. Why not? The argument against has always assumed a dropoff in talent which would not be the case here. The "Romo" drive could be at any point ion the game, it could open the 2nd half, it could be the two minute drill to end the first half, it could even be the opening drive.
Imagine having to gameplan against that, not knowing when the rhythm, style, and individual attributes of the QB is going to suddenly change. The offense would suddenly change into something they had not anticipated or could prepare for. It would throw defenses off balance. This strategy is used for RB's why not QB's too?
like I said, I'm a greedy bastid, I want to keep both.