Some missing of the point going on here...
Too many here are obsessing over the equivalent of blackboard or whiteboard in the classroom.
We need to make sure we are education kids not training them. Just stuffing an RPi in schools, without learning the fundamentals of logic and control will just be training them not educating them.
It is a tool just like a plane or a lathe or a pencil. If we don't teach the fundamentals then we will never have the success that is wanted. Pick the right tool to teach at the level the kids are at. Lego Mindstorms is a better way of teaching fundamentals of logic, control etc. During those lessons it will become clear that there are some kids that will want to take things much further than others, this is where the RPi and its like come in.
There is no one size fits all solution for a problem that cannot easily be defined. What is the basic level of technical skills we want 16-18 year olds to leave school with? The ability to think through a problem, to recognise when they should try and automate a solution and when not to bother and the ability to pick the right (to an order of magnitude) tool for the job be it BASH, Python, C++ or ....
Change technical to medical and I think the answer becomes easier to explain somehow - first aid skills, CPR and confidence that if they were witness to an accident they could help keep someone alive.