Why doesn’t the Universe have a shorter life-span? Why don’t we have a longer life-span, or live forever? And you're assuming you don't exist forever? Still looking at only the physical spacetime manifestations around you and not looking with the spiritual eye? 'What IS the Universe' may be far more than you have discerned at this primitive time in the history of the Universe. And that may be the point of you being alive in a body now, before the greater Universe is yet to be discerned and observed using the power of the sceintific method. Spiritual Faith is a really tough sell if there are no unanswered great questions. Faith may be a force or dimension of extreme importance that you learn to express now while it cannot get others into more danger than it does. When you use faith to sit upon a chair, you endanger no one else in the room usually if the chair fails to hold you. If you express faith that God is and is a rewarder of those who dilligently seek Him, you harm no one and may actually develop your yet to be vital 'faith force'.
What’s the point? Obviously humans will not exist on this planet indefinitely. Another 500 years? 5,000 years? 500,000 years? If you are not a spiritual being in a physical body, what difference does it make, you were and then you are not. BUT, if you are a spiritual being in a short-lived physical body, you will be 'graduating' to the next stage of your existence more quickly than say a being who spends five or six hundred years in the physical body. The time scales of these stages are up to the Creator's plan, if you believe you are a spirit in a body now.
"What's the point?" Sad, to ask that when you could ask, 'what has God in Mind with this arrangement?' If there is no God, you lose nothing in taking the 'hope' approach, whereas the 'what's the point' removes not only hope but purpose, unnecessarily.
Oh, and BTW, it may well be that this relatively calm period is the only period during which your ‘primitive’ life could come to be in the lifetime of the dynamic Universe. If it has taken four billion years to make you, and the Universe you have this physical body in has been around for fifteen billion years, the window of your coming into existence may be closing, and a more restrictive less hospitable Universe may be approaching.