1) Increase crime long term.
2) Weaken the mandate of the Supreme Court, and destroy any trust people have in it.
3) Financially disenfranchise poor people further.
4) Hurt rape victims.
The High Court of Australia is a far less controversial institution than the Supreme Court of the United States, arguably significantly more trusted – precisely because its justices (unlike their American counterparts) try very hard to stay out of controversial social and political issues and prefer (with occasional exceptions) to stick to deciding boring legal technicalities instead. No doubt it is easier for them to do so, given how little Australia's constitution has to say about individual rights–but I think if you gave the High Court of Australia the US constitution to interpret, they'd interpret its individual rights in a similarly dry, narrow and literalistic way. It is decades too late for the US Supreme Court to unanimously adopt the same strategy; now that strategy gets labelled as "conservative"/"right-wing"/etc when in Australia it is viewed as politically netural.
Australia has no constitutional right to abortion, and yet it has a liberal abortion regime nationwide – which was attained state-by-state, through a combination of state legislation and state court decisions. The federal legislative and executive branches mostly avoided the issue, and the federal courts (to the best of my knowledge) stayed out of it completely. It is much harder to make a big political deal out of something which is a state-by-state issue than when it gets decided at the national level. Activist/lobby groups (on either side of the debate) thrive on the national media and attention of federal politicians, both sides would be weaker if it had been a purely state-level debate.
I think, if Roe v Wade had never happened, most American states would have moved to a liberal abortion regime with time (maybe with a handful of conservative holdouts), but it would have been a far less heated political and social issue. I think it is very likely that, the abortion law regime post-Roe v Wade's overturn, is going to be much more restrictive (in many states) than it would have been in the same year in a timeline in which Roe v Wade never happened to begin with.
I broadly agree. IIRC, Roe liberalized abortion by fiat shortly after a handful of states did. That totally fried the normal political/social change process and pissed off a boatload of people, which got us where we are today. Liberals got what they want, but at a much steeper cost that if they'd been more patient.
What? No.