Belgium and ViennaIt is almost certainly the case that true Free Disposal in the Bryan Caplan sense - in which suicide actually has no cost - would result in a world no one would want to live in. For one thing, a huge reason people feel compelled to stay around is the existence of social bonds; therefore, social bonds place a major cost on suicide; a world with truly Free Disposal would not allow social bonds to form. But social bonds are among the most basic human needs; a life without them would likely not be worth living.
If we look favorably upon, as a consequence of the post-60s social pandemonium, the heuristic many ancient sacred prohibitions were entirely crypto-utilitarian public policy, doesn't the taboo of suicide in both eastern and western make you want to at least want to steelman the the pro-natalist/anti-suicide position, which I've not seen on your blog? Or a piece of Freudian self-critique.
You can't remove the barriers to suicide for the terminally ill without removing them for the non-terminally ill, history has shown that the slope is slippery, and I think you want that slope to slip right? For many, the nightmare of failed suicides is a feature, not a bug. To be very generous, suppose that a state apparatus is set up so that the pills can't be stolen to commit murder and everyone not in an altered state of consciousness can use it for free on site, a perfect implementation mechanism, might there not be a domino effect? Depressed son kills self, mother follows, so does father, completely formerly healthy and well adjusted sister 1 follows, sister 2 does too, friend of sister 1 and 2, etc etc until this happens.
And now even the happiest people who don't kill themselves out of sorrow are psychologically crippled wastebaskets; In high school we talked about smart people who ended up in shitty colleges and a common pattern was "s/he had a friend who committed suicide and s/he was so depressed for a few years he only got Bs and Cs." People regret things and wish other would've stopped them from doing stupid spur in the moment things all the time.
The chosen-ness of life is not binary but a continuum. Gruesome punishments may be heaped upon the act of suicide, making it very un-free, or it may be actively promoted, making it much more free. The suicide restrictions of old cultures give us a good idea of the degree of freedom regarding suicide that may be permitted and still maintain a functional, self-reproducing society.
Your question illustrates an important dilemma: life is unfree, and must be unfree in order for it to go on. Both at the level of culture and at the level of the individual, the freedom to end life is at odds with the evolutionary goal of self-replicaton. Some will be miserable, and societies rely on keeping miserable people alive by force in order to survive. It is my contention that they do not necessarily deserve to survive.
The Old Ways are fascinating, intricate, carefully evolved structures, and they are also not that great. Certainly they have failed us under modern conditions vastly different from the conditions under which they evolved. A person choosing to have a child now cannot really offer it a functioning, reliably self-reproducing society in which to live; but lives in past societies were not necessarily worth living, either. Keeping humans in line with evolutionary goals requires the use of both force and illusion. I am very suspicious as to whether these goals line up with eudaimonia. If the freedom to avoid the experience of life results in this, then maybe it is not such a great experience after all.