In my opinion, thanks to the Internet you can get theoretical knowledge almost in every sphere. And even become a professional unless the chosen sphere requires some specific practice. For example, for becoming a health care worker. But if you want to be a developer or translator, all you need is self-discipline and high motivation.
This is the good thing in our new world, you don't really need school since there is an internet, you don't need to have a class room since you have your own PC and you do not need to have a teacher since you have a lot of sites to visit with a lot of MOOCs (massively online open course).
Maybe the problem here is the certificate since in our country, you still need the certificate to apply to better jobs.
I agree to you that who gives you the certificate since most of the company in our country when hiring they should have certificate or diploma so much better you have to go to school to have your certificate, so education is important in school. But still possible can educate through internet .