You should always be challenging yourself to get better. In doing so, you might find that another area of the studio becomes more interesting. Perhaps you start as a modeler, then find yourself writing scripts to speed up your workflow, so then you transition to a TD.
Yes. I don't do much 3D anymore since it al just starts feeling the same to me. Especially adding details to a highpoly for the sake of it. I'm with Racer445 here. Also I do think part of it is because the modeling tools are so bad these days. Autodesk programs are a joke, relics from 10 years ago that have barely evolved…