Even if it didn't affect anything, it'd be the research opportunity of the millennium, like free interstellar travel to explore an exoplanet.
Imagine something the size of Earth swinging through on the same path as Oumuamua, coming from some ancient and unknown place.
All telescopes everywhere would focus on it obsessively as long as they could. Engineers would miss sleep for weeks trying to find a way to visit that world before it disappeared forever. Maybe it would even have frozen life!