There are so many issues in this that I hadn't even thought of! I was just mulling over the idea of distopias/ feminist utopias generally and the concept of artificial wombs entered my head.
There is a huge social element to gestation isn't there? Babies aren't the blank slate Locke thought they were. If babies are born with a 'mother tongue' as I'm sure some research shows, what would happen if they were never exposed to language inutero? Would they play rosetta stone tapes next to these 'baby machines' or something?
There's also the taste element. Would parents get to choose what the amniotic fluid would taste of, just as if the mum was eating chocolate or curry? It's all just to bizzarre to contemplate.
But medical science has pushed the boundaries so far so quickly, who knows what the future will hold. But if we're still living in a patriarcal world at the time, we can be sure that it will be controlled in a way to benefit men and not women or children. God, what if they try transfering aborted embryos into these?
I did once read an article about a woman who gestated a healthy child without a womb (it had attached itself to her intestines after a partial hysterectomy). They said it was a 1 in a billion case.
One future scenario I can see happening sooner is all women being sterilised at age 12 or something and having to apply for a licence or somesuch to have IVF later in life. Then they would probably reclassify rape as mere assault because it would no longer have a risk of pregnancy. Not that yuou would even have rape then anyway because why would a woman refuse sex ever if she couldnt get pregnant (that's sarcasm, btw, in case it doesnt 'translate' on screen). Hell, I'm in a cynical mood today!