inspired by interiors

This spring break I traveled. I met new people, refreshed my outlook, charged my heart's batteries. One night, after watching Crimes and Misdemeanors (Woody Allen) with some new friends, I fell asleep thinking about Interiors (another Woody Allen movie). There is one line from Interiors that always ends up echoing in my head and I end up arguing with it. The argument is always the same, and goes something like this:
Head (which sounds suspiciously similar to Diane Keaton's character in 'Interiors'): "Life loses its meaning in the face of death."
Jenny: Really? You think so?
Head: What's the point? I mean, you saw 'Stardust Memories'- no matter which route you take or how much money you spend on your first class ticket you end up in the same dump.
Jenny: I'm not sure I agree with you. I can see why some would. Because death would mean that, no matter the course of our lives, we end up in the same spot, like what you said. That makes sense. We can struggle continuously without really moving anywhere.
This is not, however, absent of meaning. If life were never ending, if we were immortal, how would that infuse any more meaning? I think it would dilute any meaning. Our actions and thoughts would not be as precious. Since we would have all of the time in the world, we would simply be running this metaphorical treadmill infinitely.
Life, in the face of death, is a choice. We are allotted a certain amount of time and the way we ration it out is meaningful. A sunset is beautiful because its colors are so intense and fleeting. Would it not lose its beauty if the sun never dipped below the horizon?