Perhaps 250 years from medicine has advanced far enough to fix brain damage? I don't know.... the fact that we can do more in medical science now then we could 20 years ago, who knows how far they have progressed by then.
I sometimes don't understand how people find it weird they do certain things in shows set hundreds of years from now that we can't do today. We couldn't even friggin' fly just over a century ago. I have no doubt that 200+ years from now, fixing brain damage will be pretty easy.