"I’M SO OLD I REMEMBER WHEN JAPAN WAS THE FUTURE: Cuddling, robots and holograms are replacing sex in Japan." via Instapundit.
To comment on the first I could never imagine that Saudi Arabia's oil based economy would decline for a while. Especially if there is a limited supply of fossil fuels.
As for Japan, well they were expected to take over the world with their businesses. Still what we see there is evidence of a demographic decline.