> More people means less energy and resources per person though, and people with little resources wont be using their brains to solve problems.
I mean .... why? Why are we assuming that more people aren't working to create more energy, more resources? The Earth can feed, and provide far more energy than we currently are using. Pump out nuclear reactors for every town and we will have enough energy for 10 times the people. Granted, it's not as easy as saying that but my point is that energy is not finite, and resources are far more that we are currently not utilizing.
I don't imagine more people will be living with the same resources. After all, the growth to nearly 8 billion resulted in most people's quality of life rising and poverty decreasing. This is a fact. A cold hard fact, that nearly everyone on an absolute level has gotten better lives.
If we can do that for 8 billion, why can't we for another 8?
More so, increased population results in different, new problems and solving those problems results in us further progressing, not regressing.
I guess, I just don't like thinking of this as the end of history. We can grow and grow, and grow. I don't wish for humanity to simply fizzle out. We've done pretty well till now, let's keep going. We can do better.
As far as we know, we're the only species in the universe, in the whole wide universe that can truly appreciate the beauty of the universe. That can observe. Catalogue. Create Art. Sing songs and so on.
The vast wide massive universe. It deserves to be seen. It deserves to be documented. To be explored. We need to live, and grow far more than now to do that.