Tony really got the short end of the stick with some of the lines that they put in front of him. Imagine if he had the lines that Dak has enjoyed throughout his career. I doubt his body falls apart the way it did.
I'm not advocating for this logic, but I think the Jones clan felt like Tony's mobility in the pocket could compensate for a less talented offensive line, allowing them to dispurse funds in other areas. If they would've just focused on building the trenches and establishing a strong running game, Tony could have made it work with anyone at receiver, esp with Witten on board.