The industrial revolution is driven by man's ability to harness energy. So far that's all been fossil fuel and has limited what we can do - and how fast we can do it.
That phase of the industrial revolution is still going strong and has nothing to do with electronics, electricity or computers. Those developments are a completely different strand of development, and (themselves) have barely started, either.
The next phase of human-kinds development is when we break out, past the limitations (both of availability and rate of generation) of fossil fuels into a new era where there is MORE energy available to each human. Probably several times more energy.
However, if you really want to talk about computers, then we're still in the pre-condensing boiler stage. We can make computing devices that seem pretty powerful (because we have nothing better to compare them with), but they're not particularly powerful, complex or scalable. Also, it's debatable whether there is anything on the horizon (quantum, possibly - but it seems to be a hellishly complicated way to do things and needs a lot of supporting structure, compared to, say, the human brain) to take us to the next phase.
So, no. We have NOT come to the end of IR3, we're still firmly stuck in the first industrial revolution, probably for another 50 - 100 years until we get our asses into gear and get past fossil fuels. Computing also seems firmly stuck on the bottom rung, with no promising technologies to move up, past the limitations of current semiconductor processors and logic-gate based architectures.