One thing that makes the OP a better idea than yours is that no way in a million years (this is hyperbole) will any US political system ever adopt mandatory organ donation.
However just making it opt-out instead of opt-in as suggested by antisuji below seems like it would capture 80-90% of the benefit (wild guess) with 5-10% of the political fallout (another wild guess).
One thing that makes the OP a better idea than yours is that no way in a million years (this is hyperbole) will any US political system ever adopt mandatory organ donation.
However just making it opt-out instead of opt-in as suggested by antisuji below seems like it would capture 80-90% of the benefit (wild guess) with 5-10% of the political fallout (another wild guess).