I've never told my children they have to go to university, but I don't think they are adults. I do think that part of my job as a parent is to help steer my offspring toward decisions that will they will be pleased with. We feel they need to have a plan, but plan other than college can be fine. Working at fast food or retail waiting for something more interesting to "just happen" isn't a plan.
But trade school, starting a business, etc. are all plans.
I think that teens are most likely best off getting guidance from their parents but being allowed to make their own choices.