Two years may be a bit optimistic. The first human trials to treat the CNS in Russia left the patients with tumors. As a result, trials were delayed in the US until the technology could be improved. Just recently, only the second crushed spinal cord patient in the US began stem cell treatment and some experts are dubious about the trial. Further, as noted, these trials only relate to patients with crushed spinal cords. The stem cells are encoded to grow into the cells that make the meylin sheath that covers the spinal cord. Even if these trials are successful, it's a big leap to get from the treatment of spinal cord injuries to the treatment of patients with various types of peripheral neuropathy. Perhaps 5-10 years is a more realistic goal.