Ah. I think theres a lot of people who dont mind doing a single culture. As long as the single culture is THEIR culture only.
But I dont think a single culture is possible with humans. We are trained to spot differences in other humans, and sort people into “us” and “them”.
If the one language was perfect, sure. But language is a lot more than just a way of communicating. It’s a part of many peoples identity and there’s a lot of art (lyric, songs, opera) that often doesn’t translate well to a different language.
What I’d like would be a sort of basic language that is being taught worldwide so that its possible to communicate everywhere.