So, I don't really buy arguments like this. Would your friends who are comfortable with JS but aren't engineers actually be interested in learning microcontroller programming because they can do it in JS? When you move from scripting a web page to programming on a very limited embedded system, you're changing to a completely different paradigm. Instead of worrying about the DOM and AJAX, you're worrying about GPIO and PWM and interrupts. The actual syntax of the language is a rather minor detail compared to all of this. Now, I'm not saying that we should all be coding microcontrollers in ASM or AVR C, but what makes Javascript more approachable than, say, Arduino?