Not sure if you are tolling, but to move to Android by 2011 they would have had to start in 2010 or 2009. The first Android release was September 23, 2008 and you remember how ummm "good" it was right? And on so many devices too and "obvious" that it was going to become dominant. So they could either keep printing money with their existing OS they own and know or migrate to an unknown and new operating system made by some other company with unknown problems...