He should give it every shot to play this year. If he needed to start the year inactive to get extra time to recover, fine. Even on IR, since they can recall him. But the Colts in theory could win a Super Bowl with him this year. Maybe he gets a bit better by October or November and they go on a run.
To me, completely unacceptable to do this now. If that’s the way he’s leaning, he owes it to his teammates — and the fans who, for example, spent big money purchasing season tickets — to at least try, and then retire after the season.
I’d be so mad if I was a season ticket holder that I might consider trying to sue him for the financial expenditures I made in reliance of the contract he has that he’s simply abandoning. He’s on record: “Mentally exhausted.” Not so badly injured that he can’t play.