Against: A temporary solution
As we already mentioned, age is a big factor in the decision to bring Brady aboard. No matter what Brady says, there’s simply no telling when he’ll hang up his cleats and the only thing that’s guaranteed is next season.
The Titans have been looking for a stable solution under center since the days of Steve McNair, and while Marcus Mariota once looked like that guy, he ultimately flamed out in Tennessee.
Tennessee finally got consistent play out of the quarterback position after lucking into Tannehill, and at the age of 31 (32 in July) he has the potential to shore up the position for at least the next three to four years.
At best, the Titans are probably getting two years out of Brady, and after that the franchise will be forced to find its next quarterback.
Bottom line: signing Brady means the Titans will be back to the drawing board at quarterback sooner rather than later.