Computer software and the internet have long been cognitive enhancement tools. Spellchecker obviated the need for spelling skills. Wikipedia and the internet obviated the need for fact memorization. There is less reason to earn a PhD if the module might be available as a cognitive plug-in within a few years.The need to speak foreign languages is reduced with Google Translate for Android.
Social networks like Facebook are acting as a social prosthetic. It is now possible to have a massively larger context-driven social apparatus with deep-interest specificity.
Accessing, assimilating, applying, and interacting around knowledge and information has become the critical 21c skill set.