The consequences socially would be dramatic for a time, and then, I think they would wear off. Bob, if no legal consequence for him was pursued, would have trouble facing anyone in town, but he would have been used to that. The shame that people typically had for the Ewells up until this point had to do with his drinking and living off the welfare of the county. Now, a moral injustice would compound people's ill will for him and his family.
If further investigation into the perjury of both Bob and Mayella's testimonies were pursued, Bob might have ended up in jail. Mayella may have been found out that her lies were coerced and a lesser penalty could have been given to her. If she told the truth, the state would have likely placed extra care for the children and help for Mayella. Because of that little row of flowers, I think Mayella wanted to be better than she was and I think she was willing to work for it. Given the absence of her father and the opportunity, she just might make something of herself. She could have earned a job and sent those kids off to school every day. The shame of trying to defame Tom Robinson would have likely worn off quickly because after all, he was a Negro, and the town would not have cared too much about his feelings or the fact that he was wronged.