I have the most naive question, why not change this if they know this? American companies regularly do restructuring and layoffs. Why can't these whales be dealt with that way?

Edit: I want to add I'm not naive enough to think they can just fire senior people willy nilly. I could have worded the question better but I hope people understand the spirit of it. I understand there must be reasons why this is hard to solve, I am looking to understand why it's hard.