According to ABI, the numbers are high enough for developers to remain interested enough in both platforms to continue writing apps for them. Both BlackBerry 10 and Windows Phone will battle it out for third place and both BlackBerry and Microsoft are concerned that developers will stop writing apps for their respective platforms if the number of users start to dwindle.
Both BlackBerry and Windows Phone trail the top two platforms, Android and iOS, by a large enough amount that the pair should be concentrating on third place for the time being. Once the Installed base of both BlackBerry and Windows Phone grows larger, then the battle can migrate to first and second place. ABI notes that the total installed base of smartphone users will rise 44% by the end of 2013 to 1.4 billion with 57% of them Android flavored and 21% them using iOS. At the end of the year, there will be 268 million tablets in use, a rise of 125% year-over-year, with 68% of them running iOS and 28% of them being Android flavored.
source: ABIResearch via BGR