Let's be serious, we never really use the caps lock key for anything.
Yet it's located at a prime location on the key board, where our left pinky could easily get to.
There are a few better alternative functions that the caps lock key could serve.
I personally map it to the control key, because it's great with Vim. Although I have seen people mapping it to backspace.
Try it out, and if you have better ideas on what some other keys can be mapped to, let me know!