It seems like you are missing a huge detail here — technological development.
Feminism didn't flourish just because, it was interconnected with several factors like the necessity of women to work after WW2, he invention of the pill etc. Live can't go in circles, and you can't predict future based on past events if there are technological advancements.
I predict that people will live much longer in Western countries, up to 120 years in not so distant future. Perhaps, some of us will experience that. It can't just happen with no effect on society.
Also, life is much easier and cheaper now than it was before. Feminism also grew because before women spent all day taking care of the house and the kids or used the help of several maids. In the past in Europe, men who weren't extremely poor, couldn't survive without a maid too. Everyone would get married because it made their life more convenient, but not now.
I am a bit all over the place, but what I am saying is that the world changed significantly and every single change affects society. Patriarchy just wouldn't be viable today in a western world. It survived in African and Arab countries also for a reason. They had different history, different society and even climate.
So what I think will happen, is the implementation of universal basic income. It's inevitable. More and more work is given to machines, so the cost of living will drop until it would be cheaper to just pay everyone a certain amount of money to live, so they can contribute back to the economy. And I'm not talking about some grand socialistic ideas, it still will be free market and capitalism, but people no longer will have to work if they don't want to. We see it already, with free healthcare in some countries and welfare.
As for sexual frustration, I'm sure that surgeries will be affordable or even free for the ugliest people. Something like a "surgical welfare".