I wouldn't say that one game determines everything. If a developer decides to release a game on the PS3 that requires PS2 emulation, do we split the PS3 stock? I'd say no.
Unless it's a distinct split in what can be run on it (like from the GBA to the DS, or PS1 to the PS2), it should stay combined. If a MAJORITY of new software requires the new PSP (highly doubtful), then that would be different.
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I wouldn't say that one game determines everything. If a developer decides to release a game on the PS3 that requires PS2 emulation, do we split the PS3 stock? I'd say no.
Unless it's a distinct split in what can be run on it (like from the GBA to the DS, or PS1 to the PS2), it should stay combined. If a MAJORITY of new software requires the new PSP (highly doubtful), then that would be different.