We already require juniors to go through a 4 years university degree. It takes a fair bit of time of real world work to get to the senior level. So unless we expect people to do another 5 years of schooling, I am not sure how this will happen (and even in that scenario I believe there is a difference between hands on, on the job experience and classroom experience).
it happened with architecture degrees in the uk. it went from 3 years to 7 years, as the skill levels and implicit knowledge required increased over time.