this game sold like crap mostly due to it being a Wii title, unfortunately. Ignition US is dead, and Marvelous Entertainment probably isn't doing too hot these days either.
That's a damn shame, I bought a Wii partly in anticipation of this game. Oh well, we can always hope that Atlus picks up for US distribution if Vanillaware releases more games. But seriously, why did they release it for fail console like Wii?