As for this post the only point I was trying to make which everyone conveiniently avoided is that mankind was living without written language, buildings or farming for 194,000 years. Make what you want from it.
Human "kind" was living without aeroplanes for more than 199 000 years. Today lots of us are frequently zipping around the globe in less than 24 hours. We hop off the planes on the other side of the world tired, but we survive it. Think about it.