Based on what Kas was saying focusing on the PS2 still selling along with the PS3. I suspect what he is really saying is that that the PS4 will be released at about 6/7 years into the PS3, but they will continue the PS3 support well up to 10 years.
Squilliam: On Vgcharts its a commonly accepted practice to twist the bounds of plausibility in order to support your argument or agenda so I think its pretty cool that this gives me the precedent to say whatever I damn well please.