How in a world can a gaming console, which was obsolete even before it got released, last _10 years_??? I mean, really? 256 mb of RAM + 256 mb of VRAM, no hardware scaling, slow BD drive. And last time I checked, the PS3 OS memory footprint was something like 52 megabytes - that's out of 256! I REALLY hope it got better since then, but XBOX 360 OS, for example, takes only 32 megabytes.
Now, with the current state of things, consoles are already WAY behind PC in terms of power. So I'm guessing that in 10 years (8 years now, if I'm not mistaken), PC gaming will be so far ahead - either 360 or PS3 will look like something from the Paleozoic.
And besides, Sony's focus is really somewhere in a completely different universe - they add all irrelevant features to the PS3, trying to make it everything except the one thing that matters: a gaming machine. Its PSN still lacks basic features that Xbox Live has had for years (system-wide mute, player preference/avoidance system, way to report bad behavior etc.) But at least we have Life with Playstation, which probably nobody uses, and Photo Gallery, and Web browser, which doesn't work on probably 80% of web sites...
So, I guess, there's a very good chance that PS3 will only remain as a BD player. If BD lasts that long, that is.