I think that in some ways the deconstruction of our 'former' identities has been extremely quick-- probably too quick to have been something that just spontaneously 'happened', and more like the product of a lot of influences and conflicts that have been occurring throughout the centuries. It just seems highly highly unlikely that the history of the human race has been anything but a lot of back and forth, stability and instability, liberty and oppression etc… and all of this back and forth has ultimately produced a conflicted and confusing sense of who we are and what we are 'supposed' to do. Things like patriarchy, religion, slavery, colonialism… all of these things were rooted in ideas about the true nature of human beings, and they provided us with answers, even if they were false and oppressive.
Feminism, along with various other social change movements (I would also include things like minority rights, children's rights, worker's rights, anti-nationalism, globalization and atheism) have largely dismantled the previous oppressive norms, but they have also produced a sort of apocalyptic post- modern confusion where nobody really knows what it means to be human.
I can't remember who said it exactly, but one of my professors used to throw out the idea that '(people) are condemned to be free'… so as liberty increases, so does confusion, and our sense of place is eroded. This means that in addition to basic survival, we now have to concern ourselves with trying to find a meaning and an identity and a sense of place in the absence of clear signifiers. We use narratives to try to explain things, and some of us can even be confident about their bearing on objective reality, but ultimately they cannot be universally true-- because the truth, if it ever did exist, has either been buried or destroyed. Male insecurity really isn't so different from female insecurity-- it's all about trying in vain to recapture or create a universal sense of place.
But now we have generations who are increasingly being born into a society of remnants-- remnants of male or female roles, remnants of religious ideas, remnants of races, ethnicities, identities… and for each and every one of these things, there's this sense of having missed out on them, or not really believing in them, or desperately trying in vain to revive them against colossal amounts of resistance. This isn't to say that it's a bad thing that they're no longer 'the norm', just that without that norm it's much more difficult to find your bearings.
There's a great Canadian thinker named BW Powe who insisted that in the coming age, identity is probably going to be more important to people than anything else… I would have to agree with that statement.