So what if your chips will last 30 to 60 years, what good will a 10MHz chip be then, check that, what good is a 10MHz chip now? I can tell you what it will be in 30 years time, a working museum artifact, woohoo. Why don't you do something useful and put it in a time capsule, that way in a 1000 or so years somone will open it and be able to play Defender of the Crown.