[vidarh]

Immigration will be enough for almost a century at current projections. We have a century to find ways of countering the decline, and any improvement in that respect will make it take even longer before a global decline sets in.

China, for example, is now encouraging three children. Whether that will work or not, we don't yet know. But we'll see increasing number of countries experimenting with encouraging, then likely rewarding, higher number of children. Even a modest reversal of fertility rates will prolong the time to global decline significantly.