It’s my own kids. Just showed it to my 16 year old and he will definetely be using it for the math and natural sciences classes. My 14 and 10 year olds would be able to use it as well.
But you have just revolutionized
Document writing (Interactive Documents with magic markdown),
Spreadsheets (This is so easy and powerful that it could cause a shift. Someone will create a wrapper to create the bridge. No need for Python replacing vba in Excel),
BI Visualization (Power BI, Tableau)
Jupyter Notebook and especially Jupyter labs - Not needed any more.
Simple Web Apps (So easy to build a Blog App with interactive blog posts, Survey App, Discus App 
etc, No need for HTML, Javascript, Front end frameworks and that really heavy tool chain). You’ve just solved one of the pains of the beeware project. There will be a shift back to server side and front end developers will be developing streamlit components not the actual frontend. This is as revolutionary as the lego brick and the iphone. Democratization of code. There will be so many ways to use this that are yet to be discovered.
Getting started with Python (Someone will create that simple all cloud development experience based on streamlit with a button to push to test and a button to push to production and some functionality for installing python packages. If I was a cloud provider I would hurry up developing that so that things gets deployed to my cloud). Someone will create that wrapper for IOs and Android so that my kids can develop in Python on their tablets.
There are so many pains you have just solved by turning things up side down by sticking to the KISS principle.
You should contact Michael Kennedy from the Talk Python to Me podcast. Many of the python pains his guests have been talking about or trying to solve you have just removed. He will understand how revolutionary this is.