Cars land at Disney World?

There's been some discussion recently about Disney's desire to add a cars-themed land to Walt Disney World's Magic Kingdom.

But what I find weird is that the company has proposed taking the Rivers of America and Tom Sawyer's Island, and repurposing them to suit the purpose.

But why do that?  You have the Tomorrowland Speedway, and a bit of surrounding land that would be a more natural fit. You could make the track different, add electric to it (as they are planning to do in DisneyLand) and theme the cars to have the eyes like in the Cars movies. Then add show elements as you like.

Maybe its too obvious?