countries which may be gone in a few years?

France
Greece
Germany
Canada

The United States

The North-Eastern and Western seaboards will become independent liberal democracies and will maintain a good standard of living supplying services and know-how to China.

Texas, New Mexico, Arizona and Colorado will have reverted to Mexico.

Alaska will be sold back to Russia.

Louisiana will become an Overseas Department of France and grow wealthy as the only significant mainland part of the Americas within the European Union.

Florida will be divided up between Haiti and Cuba.

All the rest will become wasteland populated by retarded deplorables whose genetic stock will be vitiated by incest, pollution, religion, radiation and consumption of GM foods. Trump will be elected President for Life of this remainder, known as the Trump Rump.

South Africa

Tuvalu. (Rising sea levels, also the islands seem to be gradually disintegrating on their own anyway, in a geological sense).
South Sudan (I can see it being part of Sudan once again, by force).
Monaco. (On really shaky ground in terms of the Royal family, which is about the only reason it exists anyhow).
North Korea (Or the People's Republic of Korea part of it, at least. Once Kim Jong-un and his shitty family are gone, it'll probably embrace capitalism and want to merge with South Korea).