I think it will continue to sell for a long time. For me it's a must-have and will be one of the first purchases I make when I buy a Wii U. It's a game that has next to no competition on the platform (there is no other exclusive FPS shooter that uses the Gamepad this well), thus should grow together with the platform which should significantly boost sales next year. A sequel is possible, but probably in 2 years, kinda like Red Steel 1 and 2 got released.
Wii U is a GCN 2 - I called it months before the release!
My Vita to-buy list: The Walking Dead, Persona 4 Golden, Need for Speed: Most Wanted, TearAway, Ys: Memories of Celceta, Muramasa: The Demon Blade, History: Legends of War, FIFA 13, Final Fantasy HD X, X-2, Worms Revolution Extreme, The Amazing Spiderman, Batman: Arkham Origins Blackgate - too many no-gaemz :/
My consoles: PS2 Slim, PS3 Slim 320 GB, PSV 32 GB, Wii, DSi.
