That is, indeed, one major bug with this proposal. 
Then again, there are ways to rephrase and adapt concepts. Character customization for instance made the wow races prettier without any need to focus on the term ‘race’.
I’m no marketing genius and just went for the most straightforward word, but I am certain their marketing department would come up with something better if need be.
As for exploring what being a Draenei Crystal Arcanist means… indeed, that would be lovely. 