Michael: not necessarily. If the Supreme Court overturns Roe v. Wade, it would only revert back to state control. To make it illegal at a national level would require a law passed by Congress (and I don't think they'll have the votes any time soon), even so, that law could be challenged for ITS constitutionality.

"We need not resolve the difficult question of when life begins. When those trained in the respective disciplines of medicine, philosophy, and theology are unable to arrive at any consensus, the judiciary, at this point in the development of man's knowledge, is not in a position to speculate." -- Harry Blackmun, Roe v. Wade, US Supreme Court