I haven't read the link, but where would that leave children or very young adults who may not have been making their decision independently and free of coercion ?
I would prefer an opt out system, where you had to declare yourself a non donor and put yourself on a non donor register rather than an opt in system.
I am not sure I am at all comfortable with the idea of making that punitive whereby if you opt out of donating you also opt out of being a recipient.
I kind of feel it ought to be a purely medical decision based on likelihood of success in the short, mid and longer term, and urgency of need ....rather than "oh dear, you die cos you picked wrong when you thought you were immortal or these things only happen to other people".
That's a big price to pay for the crime of an uninformed and knee jerk choice.
I'd guess people opposed to donation because of careful, considered, or profound moral issues with the concept would be opting out in either direction anyway.
Maybe if we went for opt out not opt in there wouldn't be such a shortage and an idea like this would be superfluous to requirements anyway.