3DS, why so soon?

[Red4ADevil]

If memory served, the Game Boy Color only lasted for about 3-4 years until the Game Boy Advanced came. Then the DS came in 3-4 years after teh GBA, The only handheld that lasted far beyond them to date, is the original lasted for 10 years. From its launch in 89, to the begining of the new millenium.