Whilst I understand where you're coming from, surely the situation you highlighted is the exact reason many people are uncomfortable with abortion: that being that bartledvd has successfully brought up a child as a young parent in what seems a happy and stable household, despite the "sensible" option, and probably a certain amount of social pressure, to abort. The idea that Bartle and his partner may, under different circumstances, have been pressured into taking the termination option is, in hindsight, a potential tragedy.
The exact reason abortion is legalised is more to protect vulnerable women (generally), for whom an unwanted pregnancy may lead to harm of some sort - mental or physical health - or due to fetal malformity. The law doesn't, as far as I'm aware, actually make provision for abortion for reasons of convenience - though it has, though social convention, moved to leave that choice to the woman in question.
(I'm pro-choice, by the way. Just playing devil's advocate, and suggesting the potential pitfalls of making the "choice" bit too normalised/expected)