> 3D animation has killed a lot of tweening artists (the people who smoothed out animations for Disney Films like 101 Dalmations or Sleeping Beauty). But 3d animation created the need of modelers, texture artists, riggers, and more.

together with the previous comment on mechanics and stablehands, i wonder how many people in history grew up training and wanting to be a mechanic, only to be told, sorry we just don't have that many automobiles in the world, we need more stablehands. i wonder how many people went to do fine art in school only to be told 'look you have good skills and all but we just need more tweening artists'.