Thought experiment. If we did somehow come to agree on a complete ban of abortion, would birth rates really increase? Or would people shift to more contraception? GGT noted above there wasn’t any real change in birth rates after Roe, so that raises an interesting question about causality and relationship between abortion and birth rates.

The followup question is what percentage of the people who oppose abortion under all circumstances also oppose contraception (let alone insurance coverage requirements for contraception)?

If anything, the opposition to abortion and contraception would increase burdens on women, and undermine their rights across a broad spectrum of issues - whether its employment in the workforce (if you’re forcing women to have to carry unwanted pregnancies, you’re forcing them to decide between jobs (and advancement) and child rearing). That leads to lower women participation rates in the workforce, which may well be an unstated goal of these opponents who want to turn the clock back to before WWII. It would lower wages for women, and lower standard of living for women generally.