No, calm down. It isn't happening, thank Eru. But the only way for evil to conquer is for good men to do nothing. Or something like that.

Well Christopher Tolkien has already said he'll never sell the rights to it but is it legal for him to put a thing in his will where he forbids the rights from ever being sold?

Because he's not going to live forever and we must avoid a Silmarillion aaptation at all costs. It would be heinous; an insult to a modern classic.