The investors aren't trying to fix Yahoo. By some estimates, the core business of Yahoo has a negative market value meaning they're not adding anything of value. Yahoo is a dying business and they don't really hold a competitive advantage in anything worthwhile. It may make sense to wind the company down and give back the capital and resources to more worthy ventures. Yahoo tried rebranding and hired a high profile CEO to no avail. It's nothing personal but if it were as easy as cutting a few projects, offering better perks and hiring good people, Yahoo would have done so already.