Thanks to the mass sterilizing effects of the mRNA shot the population will start declining.
Sometime in the last 15 years a figure was floated that said that the "natural" human population limit, based on the "carrying capacity" of the Earth, was 9 billion, and that the figure would be peak around 2050. We just hit eight billion (we hit three billion around the time I was in Jr High) and we hit seven billion about 15 years ago.
Mao's one child limit was imposed circa 1970, so the one child generation of Chinese will start to hit 80 years of age (those who make it that far) circa 2050. By 2100, the Chinese population of China will have dropped, hard, and continue to live in the east of the country (something like 80 percent of the entire population of China lives in the east).
This probably explains some of the motivation of the regime there to suppress and "re-educate" the Uighurs. I think the Uighurs are at least one of the largest minorities, but they're a tiny fraction of the entire population.
[reprise and edit of an older comment] IMHO, by 2100 AD, the population of the US will rise to at least 1.5 billion, possibly to as much as 3 billion, while China's will decline to about 300 million (basically, the Old Switcheroo). Like China's, India's population will begin to decline in about thirty years, while the Moslem population of India may rise as a percentage.
The population of the Middle East will rise somewhat, but with most of the increase being in Egypt, Turkey, and Iran (like now). [/reprise]
Israel's current population is about 9.5 million, and even at the current rate will double in 25 years. If that Neom project in Saudi Arabia gets built within a reasonable time frame (by that I mean, having some permanent population and economic life of its own within five years), it's not unlikely that Arabs (especially younger Arabs) will bail out of the "Palestinian" squatter camps in Israel and Gaza and head there. Regardless, Israel will become second on the most densely populated list, between Monaco and Singapore. Based on their very nice tourism ads on YT, a lot more highrise there than ever before. In 1967, at the time of the Six Day War, there wasn't even a 24 hour broadcast station in the country.
Western Europe's European population will decline, in some places vanish, replaced by African and Middle Eastern immigrants, except in Italy. Even at current rates, and figuring for longevity and attrition, by 2100 Germany's population will exceed Russia's.