What exactly do you think was 'promised and expected'? Because from here it looks like deep learning has delivered an awful lot more than what anyone expected. No one expected it to beat Go. No one expected it to achieve human level results on problems like image recognition. And no one expected all this to happen in just a few years.

NNs have made measurable and enormous progress in many different AI domains in a very short space of time. There are awesome new applications and improvements coming our every day.

It's easy to say, from the vantage point of hindsight bias, that everything that's happened was predictable. So what exactly do you expect from NNs and AI in the near future? Make some testable predictions.