While I definitely think that there's limited value in our assembly-line educational system when it comes to generally increasing the capability of humanity as a whole...there's definitely a lot of variance between fields of knowledge.
Some fields are still going to benefit a lot from access to materials and equipment. You can only do so much microbiology work with the sort of products you can afford at home.
Others, especially growing fields (data, programming, analytics) and creative/psychological ones (design, marketing)...well, honestly I haven't seen much advantage to a conventional education at all. For those it seems like a person's personality profile is far more important (intrinsically motivated and enthusiastic people generally pass up the best educated in my experience...often quickly)
If you're familiar with Ken Robinson, he's given some exceptional talks on the subject and I think he's a tremendous source of information and quite capable at delivering it in bite-sized comprehensible pieces. His TED talks are excellent
, and the RSA has even animated one of his better speeches.