Rainbird said:
The NGP’s 5-inch screen is one of the console’s major draws, a feature Sony chose to pursue after the failure of the slim, light PSPgo proved portability isn’t the bee’s knees. |
The failure of PSPGo is not in the screen size. You don't go and completely remove the ability to play existing titles (UMD) and charge $100 more and expect to sell spetacular.
Though, it probably would have sold a bit better if it didn't have to compete with PSP-3000.