This is going to rub a lot of people the wrong way as unethical, but the best way to incentivize organ donation is if the donors get paid a market price for the organ. The donor is giving up a valuable piece of their body, taking time and large medical risks in surgery, and likely reduced life expectancy. If you walk through the current process, everyone in the donation gets paid -- doctors, nurses, hospital, pharma…
There are arguments on both sides of opt-out ("presumed consent"), but even the cons argue more about ethics and lawsuits -- re dead people who clearly no longer need the organs -- than that there'd be more organs available to the living who might.
pro: https://sparq.stanford.edu/solutions/opt-out-policies-increa...
con: http://www.hopkinsmedicine.org/news/media/releases/presumed_...