Who could fire them? They're in charge. The average stockholder doesn't have a clue what a magic gathering is or what demons the satanists buying that occult D&D game are trying to summon, they only care if line go up this year.
The board, assuming it isn't captured. Which is an assumption.
The settler of my trust, when I pass, has explicit instructions to bring in multiple bidders on my MtG collection, all proceeds to go to her brother within my trust, which she will then control. She is a bad-ass attorney. I would sell off a bunch of it today. but she would probably negotiate a better deal, and I am persisting comfortably.