Over the years many people have hypothesized that once WASM was really mature, it would become practical to fix the issues with web browser layout by sending down custom layout machines to users.

I would find it hilarious if LaTeX turned into a leader in that space. I doubt it could hold on to that. There's a lot of things that something designed from the beginning for web-like uses could probably improve on that would be capable of overcoming LaTeX. But I could see a world where it carves out a niche and holds on to that niche for a long period of time.