Just checking! I wasn't outright disbelieving you, but I did want you to back up the numbers and not ask me to do the work myself
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But I think you may be making a miscalculation in a number of different areas:
1. an iPhone game very rarely gets away with targeting the latest hardware. In the case of the 3GS and (which I have) and 4G, the new hardware could be used relatively easily in that for 4G hardware, games could simply use a higher resolution and spend some extra power there, but as far as I know outside of that the games that even use more power on 3GS versus 3G is tiny. I don't even know what the policy is on this for the App Store - can you offer separate downloads/games that only target iPhone 4?
If, say, the iPhone 6 would come out in 2012, and have similar hardware as the NGP (which with that size screen I'm skeptical about - what's the benefit for most iPhone users in that respect? Almost all users I know don't want more power, but more battery life. I think it is almost more likely for the iPhone to start varying screen size (rather than just resolution as with 4 vs 3GS).
Also, I think currently an iOS device will require at least twice the hardware of NGP to even come close to the same level of performance.
And finally, I am skeptical about the longevity of the growth of the iOS platform - 1 or 2 more years sure, but then I don't know. When I got my wife's 3GS, I bought it telling myself that in 2 years time, in 1 years time I would probably have gotten an Android instead for myself, and in 2 years time the platform might be ready for my wife as well. The way Android is developing now, that prediction so far seems to hold true - I would probbaly get an Android for myself today, because I want a bigger screen.
The iPad wil also get more serious competition soon, although I don't see that platform slowing down much soon myself. Heck, I may use some overtime to get my work to buy an iPad 2 for me at some point. We do actually have a legitimate business reason for it - I have a devkit for it myself, and some of our partner products have iOS clients.
Finally, a very important point is that with portable devices becoming a bigger market, there is more room for variation, and while many devices can do many the same things, that convergence may not always be convenient. If my phone had unlimited battery power, sure, I could game on it a lot, but once power is out, I also can't phone anyone, can't get my email, etc.
Nothing is set in stone and the future is hard to predict, but there is definitely still a very good possibility that the NGP corners a good market here. It has a lot more going for it now than the PSP ever had, and much more so when it comes to games, where the PSP had a disadvantage in terms of controls and UMD usage among others.
Also another point - the NGP no doubt has a suspend feature like the original PSP, as well as a game-state save feature like the PSP Go for all games, so switching games and/or shutting it after 10/15 minutes and continuing later should work just fine for any of its games, including the big ones, which will give it a leg up even against some of the home consoles.