"I honestly think it's possible that given a lot more time he might have eventually felt that his life was worth living"
I think the truth is that, given time, he would have succeeded in killing himself following one or more botched attempts.
I don't think his family thought there was no hope for him other than death, i think they supported him in his decision. I can't imagine he just said "right, I'm going to Switzerland to die" and they said "Oh, OK then."
What is missing from the story is what lengths they went to to change his mind. We don't know if they persuaded him to wait a further X amount of time and he then said "OK, I've waited and it's not better." We don't know the details of his 3 previous attempts, who found him, dealt with it, patched him up etc. We do know that his mother says he would simply have starved himself to death if he hadn't gone go Switzerland. Is that better than the dignified end he chose? Or maybe he should then have suffered further the indignity of being force fed on top of all the other things he felt trapped by.
It's terribly sad. Awful and horrendous. I wouldn't wish being in that position on anyone be it "victim" or family. It was, however, his choice. If that's how he felt, who are we to say he should have felt differently? Someone further down mentioned similarities to abortion - in the same way that I don't personally hold it as an option, I wholeheartedly defend a person's right to choose. This young man made a choice for his life and what he thought acceptable.