If I work for a company and I believe the company is going to be much more valuable in the future, why wouldn't I want equity?

I believe even on a Bitcoin standard, some companies might be more valuable than others and some new companies might have new original ideas; giving them huge potential for the future.

Potential means here to be profitable and thus to fill their bitcoin treasury.

Bitcoin will not go up forever. At some point, we will see the effect of hard money where you actually need to know what you're doing to more get returns :)

And I think having equity in companies will still be one of them.