I don’t think it is impossible.
Over time, nothing is impossible. But you have a world where as many as half of the total population is raised in illiberal cultures where national sovereignty is linked to the ability to wage war.
It’s not impossible by next century. But as my husband likes to point out (age 65ish, raised in Syria and Saudi Arabia) “it was only two generations ago when people were being born in tents.”
As the US’s hamhanded attempts to “extend democracy” have shown, you do not create a liberal society simply by changing rulers; it’s a cultural mindset which evolves over generations.
So, will it happen? Sure. Will you or I see it? Nah.
I would be moved to tears.
You’d love this movie.