You have to take a salary cut, but it will pay off in the long run. Taking a salary cut to change careers may seem a very undesirable proposition. It's similar to climbing a tree only to find the branch you're navigating is rotten. You have no real choice but to move down before you can start back up the tree in a better direction.
Career change is inevitable.
New businesses comprise new job functions and that means you'll need new skills to tackle new opportunities. It's likely your career will change more than once in the next ten years. There's a price associated with that, and it's worth thinking about how you'll pay it. We're talking about discontinuous career change. That is, the learning curve you're riding doesn't just get steeper.