Killing one of their cash cows wouldn't make sense.
And really PS2's sales don't hurt PS3's ones, right now they have different targets.
Unless sales fade away before, PS2 will die when PS3 will become cheap, and it wouldn't be bad for Sony, if it will cost little and PS2 games market will sill be desirable, to put again BC in future PS3 models, it would ease the definitive transition and keep cash coming from PS2's best sellers.







