XBox 360 Price Drop?

Microsoft is now making money on the 360.  Is a price drop imminent?  Planet 360 did an interesting article here.  It won't suprise me if we see a price drop once the PS3 begins to ship in higher numbers.  How much of a drop?  A year ago Microsoft was losing approximately $126 per system (premium).  That has now switched to about $76 profit.  There is a lot of wiggle room for Microsoft.  Just how long will it be until we see a $199 premium system?