I think the other definition is fine, as long as licenced software is still being produced then the manufacturer is still making money off the platform.
Production life of the console isn't necessarily a good definition, the manufacturer could stockpile and continue shipping consoles long after manufacturing ends. I expect Nintendo had already stopped production of the Gamecube before Wii had been released, but they were still shipping them.
If you want to make a list then you'll have to use verifyible dates, obviously launch date is easy, but for end date the only readily available dates are software releases. So then it comes down to either officially licenced games or first party games. This data should be available for all consoles, any of the other definitions I've seen in this thread are too vague.
As for Sony's definition, I take it to mean that it is the length of time they are still producing software for it. Whether there will be a first party PS3 game released in 2015 remains to be seen, but I doubt it.
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