It's here already. It's called basalt fiber; ~80% of the strength/stiffness of carbon (e-glass has about 50%), electrically and thermally non-conductive and oh yeah, it costs only a little more than e-glass since they mine it rather than synthesize it like carbon fiber.
Right now carbon is still sexy but some day soon some bright new company will figure it out. It's about the performance/cost, bang/buck however you want to slice it! If we go through another carbon fiber "shortage" ($$$) like back in the eighties, it will probably happen sooner rather than later.

Jimbo