Some believe it's because Artificial General Intelligence (AGI) is simply unachievable, others say it's because we just don't have the computing capacity required yet, and then some think it's because we're lacking a fundamental breakthrough, we just haven't grokked the "general-purpose intelligence algorithm". Deep learning is impressive and cool, but it isn't strong AI, it's simply much better machine learning than what we've had until now. Provided that we do eventually create AGI, these AIs will likely reach and surpass human intelligence, but this process is could take years or even decades of iterative refinement.