He's arguing backwards, probably out of frustration. Federalism solves this, as it solves most issues. Roe vs. Wade was a terrible decision, based on a non-existent "right to privacy" provision in the Constitution ("emanations and penumbras," as the court wrote). It extended federal government power willy-nilly everywhere, thereby creating endless arguments over actually funding abortion. Banning various aspects of abortion doesn't cost much of anything.
And if Roe vs. Wade were overturned, it would not outlaw abortion. It would simply return abortion law to the states, where it belongs. Some states would ban it. Some states would restrict it. And some states would allow it.