Quantum computers would be a game changer but I don't think it would be sustainable long term. Humans are greedy so to succeed in such an endeavour of AI actually materialising, I reckon is to have all of the world's data contained in a person... a super human. Our bodies have incredible capacity to retain data, more so than quantum computers, let's not forget we are made of star stuff and have like mini black holes in our brain so essentially have the DNA to disrupt the space time continuum.
I think as a species we've barely scratched the surface of what we're capable of. Imagine cave persons, could they have imagined that one day, future humans who share the same DNA will be using smart phones? Even just 30 years ago, if us a species can do this much, imagine what we could do in 1000 years. I tell you it'll be more than just mastering AI who could never be human because AI aren't designed to make mistakes. The best discoveries come from mistakes, anomalies, trial and error, it's a human thing.
I appreciate the automated aspects of AI though but an AI isn't that much better than for example an autistic kid obsessed with maths. I believe the human species is evolving inline with evolving infrastructure and AI is just a reflection of us evolving as a species... like some meta way of recording history since history in the traditional sense is considered dead now.