"Wave goodbye to the mobile market M$!"
As much as we all wish this, don't be too quick. If that system is even half arsed, then MSFT can find some small Chinese manufacturer (remember HTC?) that aspires to be bigger, bribe them (I mean "give marketing incentives") then "give marketing incentives" to networks, and we will have another bastard breeds of mobile handsets on the shelves.
Also iPhone is not a competitor for WinMo. It is only locked for 1 range of phones. The true one is Android. Android is controlled by archrival Google, it's free and open source. Everything that they hate. Also it can be used on wide range of handsets which directly competes with WinMo. Just look at HTC. They pretty much lost it. Even the flagship handsets are switching from WinMo to Android.