It's difficult to say exactly what would have happened if Vladek had decided to stay with Mrs. Motonowa. However, it's likely that he would have been able to avoid the concentration camps and the horrors of the Holocaust. Vladek may have been able to continue living in hiding with Mrs. Motonowa and her family, or he may have been able to find another safe place to live. Without the trauma of the Holocaust, Vladek's life may have taken a very different path, and he may not have faced the same challenges and difficulties that he did in the aftermath of the war.