I sometimes wonder where he'll be ten years from now -- will he snap out of it or degrade further and be committed to a psychiatric hospital?
I strongly doubt that he'll ever go to a psychiatric hospital of his own free will, and if there was anyone who genuinely cared for him, he got rid of them a long time ago. Effectively, he'd have to slip into a severe violent psychotic state in a public area before he could be forcibly committed. Keep in mind that derelicts the world over frequently suffer from varying degrees of mental illness, especially in America where people actively dislike the concept of public health care, unless a family member takes the opportunity to try and get him into a long term care facility, he'd be strapped down, drugged up, and as soon as he calms down enough he'll be rubber stamped out because the facility has a waiting list twice as long as its capacity. He'll be sent home with a pocket full of drugs, which he'll either flush down the loo immediately or make an attempt to sell, and settle in right back to where he was before.
If he's lucky he'll be able to fight off any illnesses and infections courtesy of his terrifyingly unsanitary habits, but changes are good he'll catch a bug strong enough to kill him. Alternatively he could obliviously step into traffic while 'talking' with Twilight, or be completely paralysed by fire breaking out in his house and not be able to escape. He might even approach some children again, asking them if they want to pat soft toy Twilight and be killed by a king hit from an irate parent.
Basically, what I'm saying is that even if he were forced into psychiatric care there's no way in hell it'll stick. The thing with mental illness is that if it's purely organic, that is to say it's not a consequence of drug abuse or physical damage, then it doesn't change your personality, it just brings out something that was already there. Jin claims he was a drug dealer at some point, but early evidence suggests that he's been a pathological liar from essentially day dot.
He's definitely mentally ill but he's also narcissistic arsehole.
