Success and failure are relative to circumstances. There is financial success/failure, historical success/failure and market share success/failure
Sales:
If it sells more than competition prior to release of PS4 = success
If it is outsold by the X360 prior to release of PS4 = failure
Historical:
If it sells relatively near the PS/PS2 prior to release of PS4 = success
If it sells far less than the PS/PS2 prior to release of PS4 = failure
Revenue:
If Sony profits from the PS3 during its life cycle = success
If Sony draws debt from the PS3 during its life cycle = failure
The rEVOLution is not being televised