Nobody is writing off microsoft even though PS3 is doing better than 360 was at this point in its life, despite it costing $600.
Heres a stupid link back to this site to show you:
http://vgchartz.com/hwlaunch.php?cons1=Wii®1=All&cons2=PS3®2=All&cons3=X360®3=All&weeks=59
It just shows how after 59 weeks (the lenght ps3 has been out), it has more sales than 360 after 59 weeks.