"Oh please, dependable liberal democracies are in South Korea, Singapore, Taiwan, the Philippines to an extent, Turkey, Indonesia, Ghana, Senegal, South Africa, Botswana, and all over Latin America."
South Korean democracy is less than 25 years old. Singapore is run by very polite fascists. Taiwan's democracy is even younger than South Korea's. The Philippines has had numerous coup attempts of varying seriousness in the 25 odd years since Marcos was kicked out. They might have a fairly solid democratic system now, but in all these countries authoritarianism is in living memory.
As for Turkey, Indonesia, Ghana, Senegal, South Africa, Botswana, the issue is even more complicated. Turkey had a coup-in-all-but-name as recently as 1997. Indonesia had an authoritarian regime right up till 1999. Ghana and Senegal are only came out of military rule in the last two decades. South Africa, while unrecognizably better now than under apartheid, still has serious societal problems and an increasingly corrupt ANC has virtual one party rule. Botswana has never had an opposition party run the government.
I always mentally include Latin America in the West. Didn't make that clear. However, virtually every country there also has only a relatively recent experience with real democracy. Offhand I can only think of Costa Rica as an example of a state that hasn't experienced a period of military rule recently.
I meant dependable in the sense that any undemocratic form of government would be unimaginable. A democratic reversal is much more likely in, say, Ghana than in Finland. I hope we don't see a rollback of democracy outside the West, but I really think it's possible. The plain fact is that tanks rolling down the streets of Dublin is unimaginable, while tanks rolling down the streets of Dakar or Manila isn't yet.
Decline for the West is bad because the rest of the world hasn't accepted the values of the Enlightenment wholeheartedly yet. I happen to think those values and ideas mean something and are worth defending and spreading.