Seems they may be going that way again, selling at a loss.
Without knowing the final SOC size, 14nm+yield why even assume this? You simply can't compare PC GPU board prices with these licensed pre-financed custom deals. The market and product financing is completely different.
The XB1 SoC is around 360mm2, AMD Tahiti/7970 GPU had 352mm2. Did we pay a comparable price? No. But both are closer in real cost than actual "market price".
Polaris10 is a lot smaller and adding a CPU+misc will take even less size comparable at 14nm.
Following MS's latest narrative about their next console I expect heat is a far more pressing concern than squeezing out the last few USD when these few USD per console might be the lynchpin deciding success or failure.
Better spend money on hardware than waste it on PR fighting an already lost battle. My understanding is that Phil Spencer took that lesson to heart from the 2013 debacle.