Earlier quoted context omitted.
Could you be conflating 3d graphics artists with 3d graphics programmers? The former make 3d models for games. The latter writes 3d graphics systems to take those models and show them on the screen. The former is relatively low skill (as you say, it's a saturated market) the latter is very high skill (linear algebra).
Video game makers employ both, over work and under pay both. Artists make about $30k, programmers make $50k.
In Montreal, that's pretty much just Ubisoft, isn't it?
Anyway, the original suggestion was 3d graphics, not necessarily for games. Lots of other fields use 3d graphics as well. I don't know how well they pay, though.