Hilman,
First, the only thing these stats show, are the sales during quarter 2 of 2010, compared to the sales in quarter 2 of 2009. It does not mean that 17% of the current smartphones run Android OS - the majority of smartphones bought before Q2 2010 (over 99% of them non-Android) are still in use.
Second, these numbers show that the current sales of Android phones have increased to some decent share from the very small figure a year and a half ago. All kind of growth from a very small share will most likely look impressive.
Third - these numbers say that in Q2 of 2010 Samsung, LG, Motorola, HTC and others combined managed to sell a total of 10,606,100 of Android smartphones, in the form of many old and new, but always the best, models, while Apple sold 8,743,000 units of the one year old iPhone 3GS. The first conclusion that can be made, is that Apple are doing much better than any other smartphone manufacturer, and that wasn't (and still isn't) their core business. Where will Android take more market share from? Certainly not Apple. Another recent poll among Verizon subscribers, the biggest seller of Android handsets, shows that 52% are willing to jump to iPhone if it's available on Verizon. Granted, not all of them are currently using Android handsets, but it doesn't look like a potential increase of the Android share will occur as a result.
The interesting stats will be for Q3 2010, which will reflect worldwide iPhone4 numbers, as well as Q4, when W7 will be released.
BTW, what do you mean by "W7 own lack of development"? If anything Microsoft seem to be very serious about this particular aspect, and the potential gaming platform integration with the XBOX360 looks more lucrative and promising than more free open source apps from the Android App store.