I have value in life, why can't I have value in death? While I'm living, I am free to give the results of my value to anyone I choose. Why not in death?
You generally don't want to start going that road.
> Fast-forward 20+ years, and it'll become expected part of life,
Yes. I think people will probably have a reverse mortgage like thing where they will be able to borrow (but lot less) money today with a promise that they will have to donate their kidney when the time comes. People with certain ethnicity, blood group, genetic makeup etc. will become more valuable and hence will be able to derive more value and hence "rare type" will stop being rare type. This is a great outcome.
At the moment rich people from developed countries hunt for organ donors in Mexico, China, India and Africa bringing a lot of misery to those countries and money for the politicians and smugglers. Do you really like little Indian kids kept in a basement forever only to be killed like chickens later for their organs ? Or would you like to see the American justice system being applied to maximise individual freedom with full protection of law ?
They are not powerless to resist the ethical incentives. They are ethically corrupt and your implicitly endorsing their corrupt behavior by treating it as an inevitability that is better commercialized than eliminated.
In any case, it seems far more likely that some combination of medical technologies is likely to lead to lab-grown organs before the establishment of a fleshy stock exchange.
Personally, I hope genetics will soon advance to the point the organs can be grown, thus rendering the whole issue moot.
College education is an example. People will spend resources on whatever they think is useful. Who are we to judge ?
We've gone so far away from proper notions of the purpose and meaning of a society that people are talking about selling organs to pay for public goods. I'm not talking about your proposal to sell organs. It's your proposal to do something so drastic to pay for something so basic.