I don't think they expect to get that type of success. However, since so many people (at least in The States) complained about how expensive, with some Z fans wanting a smaller less bloated Z (different opinions). Nissan figured it would be in their best interest to redesign the Z, since the Japanese market seemed to be all for a new Z period and they figured one that shared more of the 240 features would sell better in America. But all in all they just wanted a new design since the 300ZX was not selling too well in the US and a new image always attracts attention.
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