I know you want to stop wasting valuable organs from dead people that could go to help living people - and I do too! I just don't want people to lose agency over their own lives and body parts.
Then there are the wicked, amoral, heartless people - like me - who think people should be free to sell their organs if they want to. I would personally sell any of my organs (after I'm dead) for $1 each. But as a form of protest against the current system, I won't ever willingly donate them.
I hope you'll reconsider.