The national and international outcry would be deafening. But it would also be sheer hypocrisy and artificial squeamishness. We don't want to be confronted with the consequences of global poverty and we pretend we wouldn't want to exploit it. But there really is no good reason why not. Sane adults offered the choice and properly informed of the risk are well able to make up their own minds.
Reason vanishes in thinking about a great many medical ethics matters.
But having considered the question of the poor and kidney sales it makes it a little easier to see the utter fatuity of offering undue respect to the rights of dead bodies. Politicians should have no truck with all this sentimentality and declare the blindingly obvious - when you're dead, you're dead and you can't take it with you.