Nintendo has a history of creating a new model of portable systems.The original Game Boy had three new models of improvement which ended with Game Boy Micro. The Game Boy Advance had two with Game Boy Advance SP because the first one had lighting problems. The DS had 4 with the original, the DS Lite, the DSi and the DSi XL.

If Sony had more games like Chains Of Olympus the PSP would be in a better state than it is.