If the Stern family has children in their teens, it is very likely they will wait with such a decision until it is clear whether one of their children has an interest to work in the company, and to eventually lead it same as their father and grandfather. Such a decision could easily be 10 years or more away.
At any rate, selling the business would not be the best option IMO, considering that PF enjoys a special position also due to the fact that it is family owned and family managed. A trust seems more likely and would allow to perpetuate the independence of the company for the future.
Just my opinion.
Stefan