Construct 2 was first released 9 years ago, in February 2011. Back then, Flash was still a dominant technology on the web; Microsoft's latest browser was Intern...
If you use them for a game design workshop, there's an educational plan available:
construct.net/en/make-games/buy-construct-3/educational-plans
It's not like any teacher has to pay anything out of his own pocket...
Also, you're not losing anything.
You can still continue using C2 if you just can't cope with moving on.
So where's the big deal?