I personally hope PSP does good just to shut people up...
I mean a lot of people at GT or Ndose or whatever thought Xbox wouldn't stand a chance anywhere (and it's doing about as good as NGC in the US, at least), PS2 sales would be strong at first but then drop off a lot as developers continue to have problems with development and give up or their games suck or whatever, making there be no games worth owning on the system, and that NGC would 'return Nintendo to the glory days of SNES'... Did any of that happen?
I don't think arguing is gonna change anybody's perspective on anything... People who think PSP stands a chance won't hear the people who think it will fail talking and then say "Y'know what, I think you're right!"... and stuff...
And it's not gonna get anywhere when it comes to the whole extras debate either... Although I personally don't see what's wrong about sticking game systems in with other things, or sticking other things in with game systems... DVD players can play music CDs... Oh no, it's the end of the world! It should stay strictly a movie player! I don't wanna listen to CDs on my DVD player! What the ****!? Why does my CD player have a radio!? I bought it to listen to CDs damnit, not fuzzy quality music and talk/news shows! Damn the world! Damn it all!
