I believe a solution will come from non-intrusive energy directed medicine (laser, electromagnetic, radionics). eg:The Hutchinson effect can dissolve/bend metal. Wow! What a serious weapon that could be to destroy towers. The same technology could do the same to the Glial scar, then with myelin regeneration (stem cells, biotin, gonadtropin) and growth factors applied to proliferate axons regrowth and reconnection to get use back to pre-injury state.
Gary Wade makes mention of such ideas here.