China is a financial house of cards with a demographic decline, you could argue they have already peaked and are back in decline. I'm no cheerleader for the faggot West, but the CCP is hardly anything to look up to, let's not forget they had probably the harshest Covidian response of any country. What they have going is they don't have the woke virus that is quickly deteriorating the entirety of the Western world.
Russia needed another generation or two to rebuild their competency, population and institutions IMO. Again, they benefit from not being infected by wokeness, but it's unclear if the country is ready for long term conflict and to grow an economy not heavily burdened by grift and rent seeking.
I don't know much about India, but I'm sick of seeing their imported IT men walking around lonely in American suburban grocery stores, probably thought they would be dating a blonde cheerleader by now.
I think Turkey has a fair amount of upside at the moment.
There aren't really any rocket-ships to get on in terms of the economy. Any country that is on the road or at a developed-modern economy heads towards Japanification. That is, a shrinking, ageing population, with declining birth rates, an atomised society, inceldom, masculinised women etc. As I think @Parmesan
noted in one thread, the US has a secret hidden weapon in that it has an Amish population that is growing virulently.
The Chinese workforce is going to shrink at about 10 million people per year. They have the dynamism to makeup for the pressures of that, but only up to about 2050 or so, when they will likely head into a zero growth situation. Likely with many of the problems of the West.
I don't think this is a huge issue, so long as you keep you borders closed. South Korea has a fertility rate of 1.1 and that will lead to it's pressures, but so would having a fertility rate of 3.0. I think this is a natural God-given cycle that we see happening in all societies. And one of the aspects is that more conservative people are making up a larger share of births. These countries will all likely eventually end up with 2.1 fertility rates and more conservative people. In 100 years, South Korea will likely be South Korea, chugging along sideways.Something that is being robbed from other people.
The economic aspect isn't something I care too much about, as I see the basic play for Europeans to go as far as they can towards an Amish-style existence, rather than one in which they become a little richer, but broadly destroyed and atomised. And for that I see Russia as the only one with potential. Europe, the US etc. are too free. But Russia has the ability to impose a more traditional and Christian society. I don't think it's a matter of rebuilding over generations. You can see in El Salvador how dramatically quickly things can change with the right leadership. And you can see the same in Hungary. Rapid changes in marriage, divorce and abortion rates when the government shifts from a permissive stance the a supportive stance. Make having and staying in a family more appealing, make it the centre of society and things will change rapidly.
Certainly the phenomena on Indian inceldom is going to grow, likely with an uptick in terrorism. It's one facet of diversity that will always remain hidden from the mainstream. Although India will likely have the strongest growth of any large country, as mentioned above, huge portions of the country will be left living without basic amenities. This being due to the caste system having created a large population of low IQ people. This is going to be one of India's biggest problems in coming decades, there is a huge mass of untouchable dalits who are being radicalised under Marxist ideas. And among the resentful Indian middle class you will find a huge growth in what is usually now called - woke. I don't think they will see much if any of that in China.
Turkey has gone sub 2.0 in fertility, and dig into it more and you'll find that its more so educated more-European Turks that are leading it and Kurds who still have high fertility. It was Erdogan's plan for everyone to have six children, leave two in Turkey and send four off the Europe as colonists. The economic growth has been built on the back of sending more people the university, which has created the modern issues mentioned above. Turkey will likely have solid growth without the more extreme demographic effects that will be felt in China.