This is a human centric approach, which i don't subscribe to. I am not of the opinion that every human life needs saving as it is the most valuable thing there is, as i don't think it is, my own life included. I will eventually (maybe even soon) die and that's cool with me. And your take on what an ecosystem is lacks the simple fact that alot of it was only possible the last couple billion of years because organisms tend to die, life on earth hasn't adapted to one organsim multiplying as much as we do, consuming as much as we do and having a really long life expectancy at the same time, it won't work.
ego driven as it values human life so much that it ignores how much damage it will do, not just to us, but to everything in general. We need to figure out a whole lot more before we can even consider extending our life expectancy like that.
That's my take on it, but it's okay to disagree, i am not married to my opinion.