I may have sent this already but revisiting e talk makes me more hopeful that his work will deliver on its promise.  Not anytime soon, but we will see it for public consumption within 10 years with some luck.  Proof of concept has been achieved.
The University of Edinburgh homeThe University of Edinburgh

Siddharthan Chandran: Can the damaged brain repair itself? - YouTube


Professor Siddharthan Chandran works in the emerging discipline of Regenerative Neurology. His research combines laboratory and clinical activity that includes human stem cells and specialist clinics (multiple sclerosis and motor neurone disease) to both study disease as well as undertake early-phase clinical trials.

The ultimate aim of our research is to develop novel regenerative therapies for neurodegenerative disease through linked clinical research and laboratory studies that include human stem cells.