Ultimately it's because of the Internet. Sharing of ideas, remixing them, iterating on them, that's all the province of liberalism. Holding on to tradition, resisting modernization, that's conservatism. Liberalism is the rising tide raising all boats. It's always happening, everywhere, behind the scenes, in people's minds. Even the most conservative person has liberal ideas.

Liberalism is imperative, conservatism only impairs. You can have individuals, groups, communities, industries, cities, provinces, countries, even whole blocs of countries espousing conservatism, but the natural trend is towards idea evolution and that's liberalism. It might take a long, circuitous route to get there, but when you take the totality of the whole world, and the logic of ideation, that's where it's going.