[verroq]

Your argument can be further extended as "what's the point of living when eventually everything will cease to exist anyway".

But ultimately, it's these small wins along the way that help push humanity forward. I'm not going to open the "what's the purpose of life" can of worms but to dismiss scientific research because of how long it will take is a defeatist attitude. You can not predict what fruits will a particular scientific research will be bring just as you cannot predict the future.