^The only reason DS has not done as well as GBA is because the GBA is competing against the DS. Had the GBA stopped selling so well(beat PS3 several months this year) after DS was released, it would be doing much better than the DS. Also, it is competing against the PSP.
If you take into consideration that the DS has been competing against 2 other handhelds these few years, then the DS trully is selling spectacularly.







