This will change nothing. Regardless of the results of this effort, those who believe fraud occurred will be the same people who though fraud occurred before. Those who doubt fraud will be the same people who believed there was no fraud before. This isn't going to change anyone's mind. It's not going to cause the courts to act. It may cause other states to go through the same effort but the end results will be the same there too.
Not at the presidential level, but the AZ audit could show that McSally was cheated of her win. If that is the case, there is precedence for kicking out the candidate who cheated and swearing in the true winner. It happened in Pennsylvania in either the 80s or 90s with a Senate race.
Since the election was certified then if fraud was proved not sure what would happen. As long as it’s not pelosi as president.