Euthanasia needs to be extended to people suffering from chronic illness. As someone with severe Crohn's Disease who spent three years more ill than you can probably imagine if you haven't been there (constant fevers of 102-104F, diarrhea 20-30 times / day with seconds of warning, severely low iron requiring monthly blood transfusions, constant pain that was not properly controlled even by high doses of opiates, inability to eat - my weight dropped to 130 lbs and I'm 6'2", etc), I sympathize with the terminally ill, but when you have a chronic illness - especially one that does not respond well to medication - and your life is essentially a long road without dignity, support, or hope, you need the option to choose your own death - especially in a country like the US that does not offer decent medical care to its citizens.
I would strongly prefer to have cancer to Crohn's: at least with cancer, there is a winner, i.e. either you or the disease. With a chronic autoimmune disease, it's like a neverending battle of enough illness to incapacitate you completely, but never quite enough to cause you to die.
The only thing that kept me going during those three years was suicidal ideation, as it was a choice that I could make when it felt that I had no options and was otherwise completely helpless and powerless. The knowledge that I could kill myself if I chose to was the warm, fuzzy blanket that made it tolerable, and I spent much time researching and collecting things to give me the power to make that decision. I did ultimately try to kill myself and failed, but wish that I hadn't.
I'm fortunate enough to be healthy (relatively speaking) now, although I will have an ileostomy for life. It's not a nice thing at all, but given what I had to endure beforehand, it's such a tiny price to pay for the ability to live now that not a day goes by where I'm not thankful for it, even through the embarrassing incidents that arise as a result.