When a company is sitting on a goldmine, you wouldn't expect them to want to do anything else. SquareEnix has Final Fantasy; Nintendo has Mario, Zelda, and Metroid; Bungie has Halo; Valve has Half-Life. Sometimes these companies will take a brief step away from those franchises and make a game that goes relatively unnoticed, or, if it does gather a great deal of exposure, eventually fades from the forefront due to a lack of support and consistency.
Perhaps the sequels are not on par with the prior games. Or perhaps the companies just give up on them entirely after the first. Whatever the case is, here are the top 10 games or franchises that deserve a revival.