For what it's worth I don't think this accusation will go any further than the others. Kavanaugh, like Trump, has reached a position where he is immune to prosecution because of the perception that it is politically motivated. It would not matter if there was video of him doing it, bragging that he was doing it and citing a law textbook for the exact statute he was breaking in that moment. His party will simply dismiss it as partisan fake news and will demonize Bill Clinton in response. He's a partisan hack. I have zero confidence he will ever suffer any consequences.
The real justice may be long in coming but Kavanaugh may have to face it eventually. He has two daughters. Because of the world we live in, those daughters may at some point in their lives end up in a situation where a man is demanding something sexual of them that they are not prepared to give. And they will go back to their dad thinking that he will get justice for them... And Brett Kavanaugh will have to look at someone who forced/exposed themselves sexually on his daughter and he'll have to check their political affiliation to see if that person is an up and coming Republican. And if the answer to that question is yes, he's going to have to tell his own daughter to stop being a slut because look what you made the decent, honest man do to you and look at how you almost ruined his career with your whoring. While I expect the blatant hypocrisy to cause him no more than a moment of dismay, his daughters will hopefully realize what a scumbag their father is.