/dev/random: Techno-illogical

I recently stumbled over an online debate attempting to assign blame for the failure of technology to live up to society's expectations (although who, precisely, established those expectative benchmarks wasn't clear, possibly because, as is my custom, I only skimmed the first few paragraphs: tl;dr is my motto these days). Was it the fault of technology itself or of the companies that make it? In other words, is the reason we don't have flying cars because the technology is still out of reach or simply because no company has bothered to make full use of what we already have available?