Earthbound sold a Million right? It never got a sequel. Kid Icarus never got a sequel, Duck Hunt never got a sequal, Secret of Mana 2(SD 3) never got a sequel. BMX XXX never got a sequel : ).
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut