Games you'd buy in a heartbeat if they existed.

[O-D-C]

Next Zelda
Next Metroid

now lets get creative.

Knights Of The Old Republic 3 (Not MMO)
Battalion Wars 3

still not creative enough?

Metroid RTS
Legend Of Zelda RPG
New Super Mario Bros. 2 (enhanced remake of SMB 2)
Starcraft: Ghost (A boy can dream right?)
Command & Conquer: Renegade 2
Command & Conquer: Red Alert: Renegade
An Infinity Ward or Treyarch made WWI shooter