The problem with technological advancement conjecture is it's based on the principle that technological evolution is on a exponential trajectory. If man technology took this long to progress to the point it is at and has since been rapidly increasing, it therefore must continue to rapidly increase. This mindset is flawed, though (sorry Stephen Hawking). Nature doesn't exhibit exponential patterns, it exhibits sinusoidal patterns. Now, I'm not suggesting hundreds of thousands of years ago man was more technologically advanced than he was twenty thousand years ago and regressed to the point when the wheel was a technological breakthrough (although that theory has been proposed by some crackpots). What I'm saying is technology may advance to the point where it levels off and then starts to degrade (due to human fear of rapid change as well as capitalism) before building back up, kinda following along a cubic polynomial. Or, as the case may likely be, technological advancement will slow to a near crawl, taking on a shape that I remember seeing in high school and have since forgot what it's called.

And even though they've calculated how many atoms it would take to store a single byte of information (or was it a bit? whatever), they flat out said mankind is nowhere near technologically advanced enough to actually produce an atomic computer on that scale. Remember, in the Star Trek universe, Earth had to become a utopia (and drive whales to extinction) before it could explore the deepest parts of space.