Comment by smaudet

Well, there's also the almost never mentioned Rock's Law:

https://en.wikipedia.org/wiki/Moore%27s_second_law

We do have flying cars, and we do have printers that print other printers, but both were some combination of really expensive/poor quality. Technically speaking, if you take it that most cities have 3D printers, most cities then do have micro factories, however that says nothing about general feasability...

Technology requires infrastructure and resources, and our infrastructure is strained and our resources are even more so... Until the costs become pocket change for the average person, technology will just remain generally unavailable.