I'm so sorry for your situation. I am no expert here, but I have a couple of thoughts.
Rick may get a boost by seeing a counselor who would help him receive a desire to do all he can to extend his life and to maintain a good quality of life. In other words, is there a counselor who could find out why the desire isn't there for Rick right now and help to restore it?
I'm sure Gordy, War Eagle, and Tony have thoughts for you about why they are "fighting the good fight."
If Rick doesn't fell comfortable with a counselor, perhaps there is a urologist or radiologist or other health care professional you could find with an excellent "bed side manner" who Rick would trust and one who would be willing to provide engage in a very caring conversation with Rick.
Just some thoughts.
'Sending all the positive energy your way we can!