Why don't companies re-create amazing games?

[SecondWar]

The Ghost of RubangB said:

Companies do this all the time.  They've been remaking Doom, Zelda, Mario, Wii Sports, and Grand Theft Auto for years.  They just keep changing the name of the game and the name of the bald guy who kills everybody.  I could probably name 20 attempts to remake Mario Kart off the top of my head.

They changed the name of the guy who kills people in Wii Sports?

And Wii Sports Resort is not a remake, or were you more meaning Kinect Sports and Sports Champions?