When that 60 year old aunt walks into Best Buy or Walmart to buy a new computer because something broke on the old one - everything will have changed and in her opinion none of it for the better. And she won't have any choices - sure there are likely Macs at Best Buy but she's not going to shell out $1300 for a new computer when she can get one for $500.
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The entire point of the article is that technology (like airplanes) gets to a point of good enough and the opinion of the author is mainly to leverage what we have instead of the unreal future people are dreaming about (like the notions earlier in the article about people inhabiting Mars, etc.)