In the 60's as a nurse we would give a cocktail to ease people on their way if they were in intractable pain, the medical profession is actually quite good at this, though a bit too good in the case of Harold Shipman, who would have had a field day if euthanasia was legalised. The Liverpool Care Pathway sent many relatively healthy people to an early death in horrible circumstances by withdrawing food and fluids, seeing them trying to drink the water in their flowers because they were so thirsty was dreadful.
I would worry about relatives not wanting to pay for long term care making patients feel so guilty that they would sign up for euthanasia. I would trust my doctor to take the decision to ease me out if he felt that was the right course. I volunteer at a hospice, and our patients die at home, in the way that they want, having made peace with the process. It is very rare that pain is untreatable, and if that is the case then sedation is the answer, allowing relatives to come and say goodbye before going under.
Bear in mind what your are putting onto doctors. Their whole focus is on 'first do no harm'. You are asking them to kill people they believe are not ready to die. Would you, yourself, want to do that? If not, then it is not right to put that onto them.