This is really exciting news. I think the next 20 years is going to be a renaissance in medical science. Advanced drugs like this, gene therapy, and I suspect some new tools to fight contagion.
My dad suffered a stroke. He got most of it back. My uncle, his oldest brother, had one in his sixties and is now in his eighties. Maybe this is too late for him, but for other stroke sufferers any improvement would be a Godsend.