Survey's of AI experts give a median prediction that we will have human level AI within 30 years. And a non-trivial probability of it happening in 10-20 years. They are almost unanimous in predicting it will happen within this century.
What do we mean by "human level" anyway? Last time I got talking to an AI expert he said current research wouldn't lead to anything like a general intelligence, rather human level at certain things. Machines exceed human capacities already in many fields after all...
"Human level" as in actually as intelligent as a human. An artificial brain just like a biological one, or at least with the same abilities.
We are also mining general knowledge about the world from the web, images and books. This knowledge is represented as feature vectors containing the meaning of the input images and text, or the so called thought vectors. We can use these to perform translation, sentiment analysis, image captioning, answer general knowledge questions and many more things.
On top of these perception systems there needs to be an agent system that receives thought vectors as input and responds with actions. These actions could be: reasoning, dialogue, controlling robots and many other things. It's in this part that we are still lagging. A recent result has been to be able to play dozens of Atari games to a very high score without any human instruction. We need more of that - agents learning to behave in the world.
I'd like to see more advanced chat bots and robots. I don't know why today robots are still so clumsy. When we solve the problem of movement, we'll see robots that could do almost any kind of work, from taking care of babies and the elderly to cooking, cleaning, teaching, driving (already there). We only need to solve walking and grasping objects, perception is already there, but unfortunately there's much less research going on in that field. I don't see yet any robot capable of moving as well as a human, but I am certain we will see this new age of capable robots in our lifetime.
On the other hand, we can start building intelligence by observing how humans reason. We extract thought vectors from human generated text and then map the sequences of thoughts, learning how they fit together to form reasoning. This has already been tried but it is in the early phases. We are very close to computers that can think well enough to be worthy dialogue companions for us.