Tax money wasn't supposed to pay for abortions, anyway.
At that point, the United States Government is forcing millions of people, at gunpoint if necessary, and under threat of prosecution for income tax evasion, to fund what they regard as murder, morally reprehensible and in defiance of their religious beliefs. At the least there should be a First Amendment challenge to such activities.
Granted, money is fungible, so anything which frees funds for the abortion mongers to spend on abortions, even though it does not directly pay for abortion, could be considered the equivalent of making taxpayers accomplices to murder.