This would have to offer real advantages over the good books available, and the many free tutorials online.
It would be viable for some audiences (probably University departments that have not developed their own programs) IF it was cost effective. I have supplied a couple of thousand kits for about $50 like THIS:
and that has a free online tutorial like THIS:
But that's not a University course, and I know from the schools I've worked with that they have put a lot of time and effort into their curriculum.
Maybe you should combine your online system with some good hardware and sensors and actuators so the student progresses into real hands-on electronics and microcomputer coding.
DISCLAIMER: Mentioned stuff from my own shop...