You should think of Amazon more like a real estate holding company. You could be incredibly successful buying and selling properties and never actually turn a profit, because you continually reinvest in new properties. You could easily have no profits and still have assets worth billions.
That's what Amazon is, except their assets are market share and infrastructure.
Maybe 20 years is too long for you to wait, but that's fine! The stock is priced accordingly so just cash out and let someone sweat the final liquid value of the assets.
After all, this isn't some little start up that's only been going a couple of years - by tech standards Amazon is part of the old guard.