It seems to me that direct STEM employment certainly must be over represented for Tesla drivers. More than that, by their human interfaces all Teslas are unlikely to be a appealing to people with a low level of technical literacy. Zero question about it, mass appeal trends towards the lowest common denominator of competence.
By late 2020 there will be a plethora of BEV options that will be less demanding, ludditites for whom BEV is otherwise attractive will choose among those choices.
The market will rapidly shift from early adopters to mass. That will be wonderful!
There will be more and more STEM-literate people who will choose Tesla.
FWIW, old-style data modeling, including ancient use of LISP, Fortran, Assembler (beginning with System 360- so you know I am old). Later ran a sequence of financial services startups/turnarounds in a variety of countries. I am STEM only in the evolutionary context, utterly ignorant of current technologies.