Honestly dont seen this happening. A collab generally has to be fruitful for both parties. Taylor's fandom is way more powerful than BP's. Views and all aren't reflective. Taylor probably has the most powerful fandom after BTS but in America, Taylor Swift is a household name. BTS isn't a household name in America.
Also, Taylor is really into songwriting and composition. She's also into telling her life's stories or moods through her songs. Her music is like a diary. BP is fierce, dance-focused, rap-focused.
She doesn't even collab with many American artists except like the Haim sisters. Because her musical style is very different and personal.
The BP/Selena collab worked because I feel their music matches each others a bit more (little more sexy) and also because Selena is more well-known in the US but BP is more well-known in SEA and it just worked.
I honestly don't see an Ariana-Blackpink collab happening either. And this has nothing to do with talent or anything before people get insecure or try to call me a hater. I just don't see it happening looking at Ariana's career direction. She's big enough just collab-ing with American artists. Blackpink are trying to make it in the US. But Ariana has ALREADY made it in the US. And their musical styles are so different. Ariana's is way more provocative and sensual and she doesn't dance. Why do you guys get mad if someone says they don't see an AriPink collab happening? I mean why does a collab with a popular American artist determine how successful your faves are lol? They're successful because they're successful. I've seen fans jumping down others' throats when they say that they dont think AriPink is going to happen. It's like people are just thirsty for some big name to drop without even thinking about different musical styles and fandoms, etc.
I could possibly see an Ariana-BTS collab.