The overwhelming majority of the Earth's poor live in places like that, not here. However, our grandchildren will live there, too. As for the grandchildren of the people who now live there: they'll be surviving in hell.
Already the hottest countries - the ones nearest to the equator - are overwhelmingly the poorest countries, averaging only about 2% of the per-capita annual incomes of countries like in North America, Europe, and Australia, and Japan, all of which are more than 3,000 miles from the equator. Global warming is going to make the climates in the richer countries more like the ones already are near the equator.
Wealth-inequality is always far higher than income-inequality, and therefore a reasonable estimate of personal wealth throughout the world would probably be somewhere on the order of the wealthiest 1% of people owning roughly half of all personal assets.