Echoing Zooko's sentiment on quantum--I've also been a skeptic when it comes to quantum computers. However, after reading Scott Aaronson's "Quantum Computing: Between Hope and Hype", I now believe in the feasibility of error-corrected quantum computing within the decade.
Zooko on the article:
I trust Scott Aaronson! So when he says real quantum computation is probably coming in the next decade, I pay attention: https://scottaaronson.blog/?p=8329