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Don't think so. DDR is probably the only TV Plug n play dance game there is. Anyway, a console don't cost much. PS2 are dead cheap and there's millions of dance games for the PS2. Or even PS1.
There's that eyetoy thingy, but that requires a PS2 as well IIRC.
Last I checked, there are no stand alone dance games that you can plug directly into the TV.
In Brazil, we have some cheap DDR mats with "onboard" games that can be directly connected to the TV, but they usually suck hard. The game is ridiculous, there aren't many songs and they're really low quality. Good for really young kids, I think.