That's the argument made by one of the most widely respected NT scholars in the United States, Andreas Kostenberger. He's cited in this piece in the Wall Street Journal.
My presumption is that tithing is another issue on which we're going to see something of a generation gap among fundamentalists and evangelicals. To some degree, it's no doubt a reflection of the increasing across-the-board rejection of religious authority. But to another degree, I suspect the differences arise from a theological realignment that reexamines both what Scripture actually requires and what really motivates and accomplishes spiritual transformation in the human heart.