The chart you linked to has been repeated many times and refuted just as many. The problem with the chart is the staggered launches of the PS2 and PS3. You cannot compare them across all territories this way. Instead you have to look at each territory individually. I'll show you.
Japan:
http://vgchartz.com/hwlaunch.php?cons1=Wii®1=Japan&cons2=PS2®2=Japan&cons3=PS3®3=Japan&weeks=400
America:
http://vgchartz.com/hwlaunch.php?cons1=Wii®1=America&cons2=PS2®2=America&cons3=PS3®3=America&weeks=400
Total other:
http://vgchartz.com/hwlaunch.php?cons1=Wii®1=Total+Other&cons2=PS2®2=Total+Other&cons3=PS3®3=Total+Other&weeks=400
As you can see, the PS3 is not tracking evenly with the PS2 at all. In fact, if you replace PS2 with GC in those charts, you'll see that Europe aside the PS3 has been tracking closer to GC than PS2. Obviously it won't stay that way but it shows you how it's begun vs PS2.
The rEVOLution is not being televised
