Working as an architect, I have deliberately had to work to get involved in the architectural side of things, rather than being allocated only visualisation / presentation tasks (because at that stagej I was the fastest in the office at producing them). It is the same story in many other practises. Architects studied architecture because they wanted to be architects - if they had wanted to only be producing visuals, then they would have done a different (& no doubt shorter course). So, while I can produce visuals for my own projects, when needed, there are many people who I work with who can't produce 3d visuals & I don't wan't my job to become one where I'm spending my time visualising other people's work (I don't have a problem with that type of work as such - its just not where my core expertise is).
As technology has improved, so have client expectations. We are contracting out more visual work than ever before & even opened a sub office largejly to deal with this type of stuff. So I don't see the need for people to produce good quality visuals to dissapear any time soon.