Ultimately it is God who is in control.
As mere mortals it is NOT our decision to make. While they are still with us we are not to starve them to death when they are still able to eat or dehydrate them when they are still able to drink. Anything other than that, IS playing God.
We are not talking about people who are truly "able" to eat or drink. A feeding tube is something that we give to someone who is no longer able to do either. In some cases, the use of a feeding tube is probably the right thing to do. In other cases, it may not be the right thing to do. In either case, the decision to give someone a feeding tube without consent is just as much playing God as the decision not to give someone a tube.
Again, the question is who decides when and for how long to use this unnatural means of giving nutrition. The point of my post is that while I understand some people's desire to decide for everyone, I disagree with that position. Instead of trying to decide for everyone, we should be doing all that we can to ensure that the decision is left with those who should be making it. When there is reasonable doubt, I agree that the default position should be to play God and use our unnatural, life-saving technology. As "mere mortals" we absolutely have to make decisions about when to use the technology that we develop. This decision absolutely is our decision to make, and the question should be whether individuals can make that decisions for themselves and their loved ones or whether others are going to try to usurp that decision.
Bill