I think that's mainly because of the incredibly remarkable developments in computer technology. Since 1966 most industries have seen technological improvements

I think that's mainly because of the incredibly remarkable developments in computer technology. Since 1966 most industries have seen technological improvements of one or two orders of magnitude, if that. 7% economic growth compounded over 50 years is a growth by factor of 30x. Data storage per $ has increased by a whopping 8 orders of magnitude, or a factor of 100 million. Meanwhile, FLOPS/$ has increased by about 11 orders of magnitude, or a factor of 100 BILLION. That scifi writers were able to get even close to modern technology is amazing. Of course, don't forget that as late as 15 years ago, portable audio players did only have an hour or two of capacity.