I've just come to conclusion that people who say, "I want to live forever" haven't REALLY thought it through all the way. When you really contemplate existing forever you start to see underlying reasons for why you aren't satisfied right here right now.
Funny you should say that because I've come to the conclusion that most people who think longer life spans would cause a number of countless catastrophic problems haven't thought about this possible future for longer than it takes to read the title of the thread.
It seems like most naysayers imagine a life changing technology, not just life extension technology, as how it would be in a vacuum. They imagine this one thing changing and everything else staying the same. However, life changing technologies change people's lives and thus societies. And if there was ever anything that would be life changing it would be literally changing people's lives by extending them.
Over population?
Why do people have/want to have children in the first place? A number of reasons of course but one of the, I think, major reasons is, because it is a matter of now or never. Certainly for women this is true.The window for a woman to have a child will close one day (this day has already been pushed further out, by the way, thanks to medical technology that's not available to just the rich). Which makes it a pressing choice that needs to be made at some point.
Also societal expectations, soft peer pressure of a kind (peers are all having children), etc.
I think the baby making landscape would certainly change somewhat, if not significantly, if the window of being able to have a baby stays open indefinitely.
Let's not forget there are already a number of countries with negative population growth.
Not enough food?
Vertical farms, factory grown meat (not animals but just the meat), genetically modified plants, etc. Technology to produce more better food is being worked on all the time. I'm not sure why people would stop innovating and inventing increasingly efficient ways to produce food. As we've done for as long as our species has been around. In fact resource gathering is basically one of the main things we excel at.
I don't see how anything about those research has to do with immortality. Solving the problem of death is a problem far greater than just killing germs. You are just projecting some advancement in medicine into a wild prediction of living forever whether it makes sense or not.
I'm not saying you're wrong but, what does it entail then, according to you?