What would make this more interesting for me would be a pretty accurate answer to the question: "what are the chances that this could happen again if the guy started in 2014"? :)
Immigration could fill the gap but as the source countries grow in prosperity, perhaps immigration from them will reduce too.
This all depends on whether or not population will continue to increase, indefinitely.
[1] http://en.wikipedia.org/wiki/Projections_of_population_growt...