So computers as powerful as the brain will be here in 55 years.
Big deal. The question will be settled before then. I'd say the key event will be when speech recognition technology works at a 95 percent accuracy for 85 percent of voices. Networks, searching and continual processing will more than make up for the lack of nominal processing power.
So when will we have such speech recognition capability? No idea, but I bet it's less than five years. After that, all bets are off.