The above is from an article in the NY Times about a takeover bid for Hershey Chocolate. Indicates the Trust owns shares of Hershey Chocolate (and presumably Hershey Entertainment and Resorts), and has enough voting power to block a sale of assets, but doesn't indicate that the trust is prevented from selling assets if they choose. Even if there is a clause in the trust documents that prevents them from selling assets, they have made changes to the trust restrictions in the past. Another article indicates the school was originally only for orphan white boys, but the trust board has changed that to allow non-white economically disadvantaged youth to attend the school. If the Bears became a financial loser for HERCO the trust could conceivably vote to sell the team - even if there is some restriction in their original founding documents - if they wanted to bad enough. HERCO has sold off under-performing hotels and parks in the past.
The Trust, which consists of the school and some community assets is a different entity from Hershey Entertainment and Resorts, and from the Chocolate manufacturing company. The trust owns stock in the other other two entities, and some board members sit on multiple boards, and have conflicts of interest as a result - as well as conflicts in regard to other businesses they operate that do business with the trust, HERCO and the chocolate company - and they also draw rather large salaries for being on the board relative to other charity boards, which caused the PA A.G. to investigate them.
There are many reasons why the Bears won't be sold. They are making money, the company owns the arena, hotels, restaurants, and HersheyPark, all of which benefit from having the team there, the team is a central PA institution which generations of families have attended together. I have no doubt they will continue in Hershey for many many years to come. However, I don't believe that if things changed and the trust board wanted to sell the team (or relocate, or fold) that they couldn't do that. Certainly people would fight it, but in the end, if it was in the best interest of the trust, they could chose to sell, fold, or relocate the Bears.