How about leaving it like it is now, where a person can request to have their organs donated, otherwise it's a no-go? Now we are talking about an opt-in opt-out system and all of this. What's wrong with what we have?
What's wrong with the system we have now? There aren't enough organs for all those that need them. A system like I described a few posts ago (where you have to state your preference when you become an adult) would certainly increase the number of organs in circulation, which would in turn save lives.