No thanks. I can just use filesystem and network namespaces in a chroot to do that

What is the real problem?

A more fitting analogy would be if right now all the LEGO factories would stop producing, and you start building the largest LEGO building imaginable from scratch. You might be able to get all the pieces together at one point, but the Sun would explode first. (added for dramatic effect) The difficulity is getting the pieces from all the places in the world. Even from under the sea.

How does “companies finding better ways to use said resouces more efficiently” not address your problem? Diesel (with all it’s flaws) was a reaction to use oil more efficiently. Hibrid cars were a reaction to pollute less. Electric cars the same. I’m pretty sure atomic cars will be a thing in my lifetime. All these are attempts to use scarce resources more efficiently. Whichever solves the issue the best will be adopted by everyone.

This analogy doesn’t really stand. The reason we haven’t run out of oil and gas as predicted since the '70s because this panic drove energy prices up. The price rise allowed companies to figure our how to dig further, or find other ways to extract valuable resources. The price increase also forced other companies to figure out how these resources could be used more efficiently. We don’t have infinite resources, but we are really creative on how to find alternatives to solve a problem.

It feels great that if something is not present in the upstream repo, I can still usually find it in AUR.