To help me convince you that this is also true for the computer hardware industry, tell me if you have heard of anyone saying, "Man I just bought this computer 6 months ago and it is now obsolete!". But who dictates that a computer is obsolete? Just because Rev.B of your motherboard came out, or the latest processor is 200Mhz faster than yours doesn't mean your computer is obsolete. If it accomplishes the tasks you need, it is only obsolete when it won't do a specific task for you, and nothing less. The computer industry will try to convince you that yours is obsolete by releasing a new product every six months in order to keep their sales figures high and put pressure on the layman to replce their computer.