Actually, for a rather unconventional understanding of the term "machne learning", which is basically anything that makes living and working with machines easier, you don't necessarily need to make the machine's functionality more versatile. It might be enough to boost its user's understanding. With more effect, too, because an informed user by far beats any RNN-based AI.

What I'm actually trying to say is that brains are simply better at learning to grok machines than machines are at figuring out how to brain.