While I agree that RPN should be taught in schools, ease of parsing is not a reason to force them on everyone. Similarly, just because people get accustomed to lisp does not mean it's a good language. I say this as a lisp "enthusiast" using it for pretty much everything I can.
Whatever language we teach in schools should be simple and quite natural to get the hang of, and should be somewhat "industry standard" if they choose to continue with said language.
Python is a great candidate because of its reliance on indents and lack of delimeters. While "we" consider lisp's parenthesis incredibly useful, new programs find it scary. Forcing it on people does not make it any less scary.
For me lisp wouldn't be enjoyable without good tooling. Parinfer, paredit, emacs, slynk, etc. make lisp enjoyable to use and edit. Python has the benefit of
- you can quickly graphically install it
- pip is incredibly easy to use, sometimes to its detriment.
- you can edit python sanely in any text editor (even notepad).
Perhaps a lesson in introductory lesson to hy in their compsci python classes would be nice though