I mean typically we don't see affordable and electric within the same sentence. I'm sure that Mercedes is leaning towards hybrid powertrains to start rather than full blown electrics. They just wont be able to manufacture EV's at a price point that people will be interested in. As technology in this segment evolves, we'll get closer to your affordable sport ev's.
Expecting it now while the EV industry is still starting off is too much to ask for. The closest thing we can see to that happening is an electric polaris slingshot or something to that effect.