I think it's very normal to go into planning mode when you get news like this and want to "take charge" but it won't be your decision to make. In the end it all depends on what your Dad wants, what are the chances that whatever it is will work and with what side effects, how realitic your goals are, and quality of life considerations.

Every single one of us are going to face end of life decisions either for ourselves or someone we love. Make no assumptions on how he feels, and be prepared that it might not be what you would do. This is a time for good listening and attention to body language if he isn't able to express his feelings freely.

It is obvious that you love your Dad very much and he will need you to be supportive of whatever decision he makes. You will find the path you are meant to be on.

Regards JoAnne