I don't think is that simple, the happiness levels of women have not increased in recent years according to many studies, its more likely a complex issue and that aspect you mention may be a minor variable; I believe is more likely than us (our brains to be exact) have had not time to adapt to the new times where you have to watch hundreds of people with "better" partners than us just by scrolling through your feeds, and that is quite chaotic but soon enough we will adapt a bit better.