Well, supply me an alternative that isn't just a thought exercise.
Describe to me a way that the world could
work without things ending.
I'm not being sarcastic; I'm quite interested in whatever alternatives you can give. Each time I try to find one, I find holes you could drive a semi through (or come to something that simply doesn't condense into something understandable our current standpoint.)
To follow one of those lines of logic:
0. Posit a world in which nothing has an ending; nothing dies, in short.
1. As our current method of feeding ourselves relies on the destruction of something else, let us posit a universe where we don't need to eat, but all other constants are held the same (other than not dying).
2. Our cells still need to produce ATP to do stuff; without taking in other materials, they cannot produce ATP.
- 2a. Can't we take in inorganic materials? That involves the destruction of other materials, and besides that, our bodies would collect materials, preventing them from returning to the cycle.
- 2b. Screw it! Let's just power our cells directly through electricity! Alrighty! Except... how are we getting the electricity in the first place?
3. For that matter, where did the materials that make up our bodies come from? A star had to go supernova for materials heavier than Iron to exist.
Even if you were just arguing from the point of view of
human (nigh-)immortality, we rapidly run into the issues of overpopulation (a healthy human population doubles every 30 years.)
Alternatively, brains getting uploaded onto computers! Brilliant! Now, tell me how we get around the issue of corrupted data, limitations on memory, the massive memory requirements to even try to model a human brain, and where we'll get enough electricity?
No matter what you try, entropy will fight you and give you the middle finger. The only way to get around entropy is to model a universe where the second law of thermodynamics doesn't exist, which would be a universe unrecognizable outside of certain mathematical models (which might not even have the potential to produce life).
An alternative is immortality on a theological level (a heaven, hell, alternate astral plane, etc, etc)... which we plainly are not on, so that isn't a viable option.
The other argument (world with inherent meaning) starts edging in with free will, which is a discussion I'd prefer to avoid, if that's alright with you.