I’m thinking this may not play well with the voters.
While Americans have a prominent if underused instinctual fear of overreaching government, I don’t see this as automatically evil, as long as the opt-out is sufficiently easy.
But the organ donor system is seriously broken as it is. Something, preferably good, had ought to be done.
How about paying survivors for the organs of their dearly departed? You could put a suicide clause in the law to mitigate any moral hazard.
I don’t have a problem with an opt-out system per se, but I have trouble imagining any implementation which would a) give all people the reasonable opportunity to opt out, and b) flawlessly know which people have opted out — because obviously, the point at which a person has become a potential immediate donor is not usually the time at which said person can make his/her wishes known.
You kin pry my organs from my dead body!