I have conflicting thoughts about this, because it's tough playing through an injury and playing coming back off injury. I honestly think Votto still could put up a season 15 to 20% above league avg with the bat. Worst case he's league avg with the bat. His work throughout his career is legendary. His worked tirelessly in the cage, but he also did so with purpose. Early in his career he was self absorbed and was entirely focused on making himself better. It's been well documented that he's shifted and is much more willing to work with young players.
Most players just fall in line and take in whatever is being preached to them. Votto isn't at a point in his career where he's that type of player. I can see him saying well that's f***ing stupid if he doesn't agree with something, but he will challenge hitting processes from the point as one of the most cerebral hitting minds of his generation. He could impart meaningful and useful information to both players and coaches. He can collaborate with coaches to improve the process that benefits all.
There's lots of ways to construct the roster this offseason. Votto isn't going to get paid a lot of money. He's a left handed bat. If the Jays go with some young kids, I can see a spot for Votto on the roster for a lot of things he doesn't do on the field as long as he's willing to understand his role and be comfortable with not getting 550 ABs