As a former hospice professional, I believe that the symptoms of pain, mental and emotional suffering can be managed successfully with a variety of therapies. These therapies include appropriate doses of medication for anxiety, nausea/vomiting, insomnia, diarrhea, constipation, and, of course, pain.
I believe that the suffering experienced by the terminally ill can be managed. I have seen it time and time again. What is necessary is the provision of appropriate medical treatment as desired by each patient. There can be a "good death" that fulfills personal growth for the patient as well as those caring for him.
If properly managed with medications and treatments the terminally ill would not seek suicide options because they would not endure constant and prolonged suffering. The answer to this question is increased access to palliative care and hospice programs.