Sure, in the future there might be a cure or treatment to whatever they are suffering from. But the bottom line is that they are suffering. And a man or woman should have the right to say if they don't want to have to take it anymore. And if they can't manage to do it themselves, then let a fellow like Dr. Kevorkian gently aid these suffering souls into that final, restful sleep. Look folks, here's the bare bones of it.
Laws are fallable because they are made by fallable men and women.
Personally, I think the wording of the Constitution was pure genius, because our founding fathers knew that they didn't know everything, and therefore could not be counted on to draw up the laws that would be the be all and end all for the nation they were trying to found. So they made the Constitution so that it could be changed with the changing times, to take into account those new things that would need to be a part of our unalienable rights as free men and women. My2Cents, of course, outlines that laws exist to define the clear boundaries of acceptable behavior, in order to safeguard against the procivity of ethical dilemmas. He ended up discovering, of course, that everything came out as the book said it would. But it was only in testing these theories for himself that he discovered that.