I never said that state abortion laws do not go into effect as enacted. I just said that nothing prevents Congress from imposing a central solution some time in the future. Such a solution could overrule state laws by making them even more strict or less strict.
Nothing prevents it right now. It is an open question as to whether Congress has the authority under the Commerce Clause to establish a nationwide abortion law. I don't think they would under a reasonable reading of the Commerce Clause, but reasonable readings of the Commerce Clause haven't been in Vogue for more than three quarters of a century.
You, and millions of other Americans, don’t understand how the Constitution works. The Constitution doesn’t give Congress power to regulate abortion nationally. Read the 9th & 10th Amendments. If a power is not given to the FedGov, then it is reserved to the states or the people.