So you think there will be zero improvements to WP7 in the future? No new content to whatever their appstore is called?
No matter how much iOS has improved, it cannot match (yet) with microsofts cloud systems.
When looking to the past now, it is obivous that there were signs in couple of months that correlate very strongly to the success. This is just a strong indicator for the fact that you are the one who needs to study more economics.