I would revise that question. I don't think anyone in their right mind would want to trade him.
The question really is, can the Cowboys afford to keep him?
Yes, but at a very dangerous price. It would take the complete loss of any measurable depth on the team. Any injury to a starter would have a devastating effect. That is not a sound strategy going into a season.
I don't think the Cowboys can afford to keep him at his perceived market value.
I also thought the Cowboys should have only signed Parsons and Lamb before the season started because they represent the future more than Dak.