engh, sony will probably stop numbering their playstaions after 4. By then it'll be Playstation 2020 and Xbox Xtreme.
And Nintendo does have a consistent brand name for their home consoles: 'Nintendo'. They don't need anything else because, unlike Sony and Microsoft, making videogame consoles is the primary thing Nintendo does.
'yes, but Nintendo has negative press surrounding it! They need a new brand name!' No, they need to change the negative press, which is what I think they're trying to do with Nintendo DS and Nintendo Revolution.
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That's something they should consider doing when they end the current generation in the lead. When there's as much negative stigma associated with your brand name as there is with GameCube it's usually better to start fresh. Otherwise, people who wrote off GameCube as I LOVE HALO 2 might automatically write off GameCube 2.
Except they can't do that next time either because 'Revolution 2: this time 2x as revolutionary!' sounds silly.
Right now it doesn't look like Nintendo wants to create a new home-console franchise name. Nintendo's names are too specific: unless they want to make another cube-shaped system, another dual-screen system, or another 'revolutionary' system, they're out of luck next time around.