If i can, maybe you have agree to say that THIS GENERATION nothing will outsell PSP withouth PS4 (but even nope, because 3DS have good possible for break 80m, even if i don't think), but for the NEXT GEN you can't know how will happen.
Just for exemple: Sony will failed, MS will sell the XBOX division, N will become the only production of game's, the third party will make the game on next Wii, and it will sell 150-200 million... just for exemple.