We never know, that is what the original parent comment was about. Regarding gradual progression, remember - we are now in a highly connected world, where things move at tremendous pace. And a lot more population have access to the latest information. Just like the invention of the wheel, or the invention of steam engines, or the computers, transistors etc, there could be a tipping point, which could happen today as I write or tomorrow or even after a decade. We can only guess. But looking at the speed of things, I would say the probability of it happening very near is very high and is worth the hype.