Studies by Eric Vilain and others show that instead of turning on male development directly, SRY works by blocking an "antitestis" gene, he proposes. For one, males who have SRY but two female chromosomes range in characteristics from normal male to an ambiguous mix. In addition, test-tube studies have found that SRY can repress gene transcription, indicating that it operates through interference. Finally, in 1994, Vilain's group showed that a male could develop without the gene. Vilain offers a model in which sex emerges out of a delicate dance between a variety of promale, antimale, and possibly profemale genes.
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Dr. Vilain is doing some interesting work! I saw him speak at UCLA a couple of years ago.