I agree with you 100%.
If there is a "reasonable reason" a veterinarian may euthanize an animal when it cannot be saved and thus relieves it from pain and suffering. I think M&A is also very aware of this and they will find the right time. They are both reasonable people. Alberto suffers a lot from this. He does not show it but you can see it in his face. At the moment I would give the dog a few days, maybe even weeks. But this is my personal opinion. I am glad about every day that the 4 can "enjoy".
When I used to swim with my Labrador for 1 hour, he would look at me and "ask" me "was that all". This breed are fighters, you are right. I had to go the hard way too, but always with the thought that my dog does not hurt anymore and does not have to suffer.