I understand all this.
What I am saying is that in 30 years or 50 years, when the west is majority third world, and we can barely keep our lights on, and we start to resemble Africa of today, what would stop China. There is no other force out there that can contain them. At that point they could literally take on the world and win. Not that they would want to do this, they have their allies and their friends, whom they can work with and not need anything from. But the countries that caused them the most grief, and if you know anyone from China, they know very much where these countries are, why would they not at a minimum colonize them, and most likely do worse? Why would they not do this? No one can answer this, other than to bring it back to current times and say "well they can't afford to do that now", I know, that is why they don't do it now. But in an unknown amount of years, with the current trajectory of the west becoming a third world hellhole and China growing stronger, that point in time does eventually appear. Why would they not use it?