Rockstar will still consider it as a big flop.
It had the biggest budget of all their GTA handheld games and it sold 3 million less than Vice City Stories (Chinatown Wars: DS+PSP - Vice City Stories: PSP+PS2)
Instead they could have made another 3D PSP game (San Andreas Stories...)
EDIT: Actually 4 million less. (PS2 version doesn't have Others sales and when we look at Liberty City Stories, NA and Others are very close)