Never will happen. For example in the 90's they predicted that pc computing power exceeds human brain around 2020. We are not far from 2020 but computers are as stupid as before, just a bit faster.

Besides brain science has found out that each synapse has actually the power of a supercomputer, and each of the 100 billion neurons in a brain have 100 or even thousands synapses. And the neurons have a property called plasticity, which means that neuron and synapse configurations are in constant flux, day by day.

Now, good luck integrating some dummy computer tech into this highly complex neural system. Transhumans will be just mindless jerks, reacting to primitive neural trigger events, mostly failing and producing wrong reactions, if any.

But instead, in 2020 we might have that glass-less 80 inch 3D display in the living room, or as a computer display. That would be pretty cool!