I don't think artificial wombs will change much by themselves, being able to avoid 9 months of pregnancy is nice, but the thing is you would still have to take care of the child for the next 20 years, with everything that goes with that (opportunity costs, career).
Once artificial wombs become popular, within a generation people kind of forget that there was a time when having a child was painful, and will still be complaining about the difficulties of having children, despite the fact that having children would become easier.
How many people still remember (and deeply think that there was a time when when children suffered from polio or tetanus? These illnesses have vanished from developed countries, and, as a matter of fact, from our collective memory, life got better yet we have less children.
Human nature plays a role, we as humans tend to focus on actual dangers, but for this exact reason perhaps we as a society need an idea, something to believe in, that would justify having children despite the difficulties, because without that, we devolve to a basic instinct of avoiding struggle and danger as much as possible.