Subtitles and dubs already solve the practical problem of making content produced in one language accessible in another, and in a non-destructive manner.

This AI lipsyncing nonsense is more like the rash of colorized black and white movies that came out in the '80s, or the modern day scourge of 4:3 shows getting pan-and-scanned to 16:9. The "problems" these solve are viewers being closed-minded about watching movies and shows that don't have color or "look old". The final product is generally going to be inferior to the original.