Oh, sorry, I should have read your question more thoroughly. Like everyone else I haven't given as much thought to "how to cope" as to "what's going on and why

Oh, sorry, I should have read your question more thoroughly. Like everyone else I haven't given as much thought to "how to cope" as to "what's going on and why"? Increased immigration is not really a solution because immigrant fertility falls to match native in two or three generations (or your culture and institutions change to match the source countries'). Sustained mass immigration from relatively high fertility countries means that by 2140 your population will be majority of African descent. 2100 - 2200 will be the African century. My guess is that overall the situation (permanently declining population) will be handled with hand-wringing and token gestures, or silence. It seems like an "outside context problem" for capitalism.