The season pass is also $35. If you buy shadowkeep first it’s $30. If you buy it with shadowkeep it’s $25. Not all the content is going away, only some. It’s not possible to continuously expand a game without limits. Only by eliminating old content can new content be added. Pretty much every MMO does this. Even if the content gets removed, I still get hundreds of hours out of it, plus whatever rewards I receive.