Some people here seem a little confused. It is NOT illegal to kill yourself. What is illegal is to kill someone else, even if they ask you too. the problem is not so much situations like this one, but the slippery slope it leads to: grandparent not dying soon enough even though they are very ill? Kill them, fake their signature on a piece of paper, say they asked you to. Possible? Of course? Likely? Probably. This is mainly the law keeping the situation absolutely clear.
However...
It seems to me that when someone goes to court repeatedly, and can be interviewed by a judge to make sure pressure is not being put on them by relatives, wriggle-room should be allowed. But I think EVERY case should go before a court, and an appeal.
I agree that there needs to be a really robust process though I wouldn't think the court's time would be best served hearing multiple cases, I think a change in the law to allow assisted dying and then a panel of experts and an appeal system would be something that would move it on.
I don't think anyone who seriously supports this would want to see people be able to be killed with no consent and no process as it could be exploited, but there could be safeguards put in place.