It doesn't really matter how much more productive a developer is if all other roles at the company don't follow suit. Before a developer picks up something to work on a series of roles had to set their eyes on work to be done. Project/product leads, tech leads, business people stamping and deciding on priorities. Then there's all the work that happens after a developer finishes work which tends to be manual as well. Review, QA, education, ops changes, marketing material, education articles, webcasts, showcasing features to end users and lets not forget end users actually making good use of the amazing new features shipped and likely many more largely sequential processes depending on company size and product/project type.

There's no real way to get to a 10x developer nowadays. Even if a company somehow achieved the magic productivity increase in all employees you still need a 10x consumer to gulp it all down.