The PSP does still have a chance to push further into overall market presence; this year has been a good year for it in that regard, as the average has been tipping over the 25% mark. As it stands at the moment, however, its comparative success to the Game Gear's peak year vs. the Game Boy is roughly the same. We clearly haven't yet seen the PSP's peak year vs. the DS (or possibly not in its entirety; it depends greatly on how well the PSP can keep its sales elevated).
That aside, the main point is that the PSP is no more a failure than the Game Gear was. Both garnered a considerable amount of attention in their prime (which the PSP is still in), and both were noteworthy competitors for managing to gain such a huge portion of the market compared to the other systems not holding first place. However, neither has managed to be a full-on competitor to the market leader.
Sky Render - Sanity is for the weak.
