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Let's not forget the various kinds of PCI that came out with a flurry - different voltages, lanes, types, whatever. They were the most devastating of all the changes, because among other things they made a lot of perfectly good $10K+ Digidesign Pro Tools systems obsolete (among other digital audio tools that were only a few hundred dollars). Expensive computer cards are a very short-lived investment.
Today the danger is more from server-side changes requiring software updates that only run on the latest hardware. Personal example: DirecTV's iPad app needed an iPad 2 only three months after I'd bought an original iPad.
So much for the argument that the system will continue to work, you just can't update it.