I'm still against making people's bodies the property of the state.
Alive or dead my body should belong only to me, unless I've decided that others may use it after death. That, as far as I'm concerned is my right, and a basic dignity that all human beings should be allowed.
Making our bodies into commodities is not something I'd care to do, and it's a very slippery slope imho.
One could also consider that by not joining the bone marrow/blood donor register that one is allowing others to die, now there is a difference one could say in that they are drawn from a living person and can involve some risk, however slight,,but still it could be said that we're indirectly contributing to the death of others.
That may be true but such is the price of free will and autonomy.
Organ donation really does need to be more widely discussed however, in order to increase the number of available organs.
The only exposure that many people have to the idea is from the occasional advert or poster that they see.
There could many more opportunities to promote and discuss the possibility of donating one's organs after death,but we could be making better use of those.