As long as the Ancient Ruins Space continues to exist in the outside world, the Spatial Passage that connects it to the Main Plane will undoubtedly have certain self-healing abilities. The only difference lies in the speed of the healing. At this moment, as long as Zhou Tian is willing to wait, the Spatial Passage will return to calm eventually. At that point, as long as Zhou Tian doesn't tamper with it, returning to the Main Plane shouldn't be dangerous.
However, it seems clear that Zhou Tian is unwilling to wait. After all, although the Spatial Passage will certainly heal, no one can guarantee how long this process will take. If it could take several days or even months, then waiting is not a problem. Zhou Tian still possesses the patience to wait for the sake of his safety.
But, nobody knows how long it will take for the Spatial Passage to heal, and this gives Zhou Tian some reluctance to wait.