Does anyone remember electronic calculators and digital watches? Both used to be big, big in popularity and big in price, if not in size. I used to do office work on my summer job using an old hand crank calculator, so electronic models seemed a great advance. Over time the price came down and the capabilities went up, and then the pocket calculator was really subsumed by other electronics.
I try to keep that lesson in mind: electronics changes faster than you expect. Here's another example: a NM super computer which the latest thing in 2008 is now outmoded and uneconomical in 20013.