Heh, it really depends. You can accidentally pick an engineering field that goes out of style, and then you're fucked. Ask the nuclear engineers...
Or you can pick a field that goes wildly INTO style, and then everything changes and you're fucked again. I remember thinking in 1995, boy I'm ahead of the curve learning about these great new technologies like DNS and email and the web... I'll be the expert. And for a while, I was. But a few years later, it all became so important and universal that large sections of my advanced knowledge were being broadcast on national TV. Ads during the fucking Super Bowl for domain registration... things only geeks like me were supposed to know about!
But ya know, water still goes through pipes... and the rules of electricity are permanently fixed in physics.
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