It takes many generations. Human generations are quite long.
Without a technological civilization, the oldtime pressures of hunger and violence will dominate everything else - Which in some ways favors various means of birth control. Because having 6 kids and having all of them die due to splitting available resources to many ways is not a successful strategy. Therefore, your projection only makes sense in a continuing technological civilization, in which case engineering happens.
And again. Most people have kids. Successful use of birth control allows you to control time and number of said kids, the mosquito analogy holds no water whatsoever, if you want to model the selective advantages / disadvantages of this, you are going to need extensive real world data over generations- and a computing model projecting forward, and you would still be making stuff up.
Therefore, your projection only makes sense in a continuing technological civilization, in which case engineering happens.
Agreed. But the speed of technology is estimated quite variably. And at least currently there are already ethical (read: memetic) constraints on applying technology to reproduction. So one could argue that the selection pressure is already doing its work.
you are going to need extensive real world data [for] projecting forward.
Agreed. What do you propose? Assuming it too complicate to contemplate?
You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
And, while this is an accidental exception, future open threads should start on Mondays until further notice.