Let me remind you something that your memory doesnt serve you well. NOKIA board hired Elop because they clearly saw that Symbain was dead man walking. If Symbian was so great, how come NO ONE licenses it now,
The sign of great companies is when they notice the need for change long before it becomes catastrophic. NOKIA leadership didnt plan well, didnt execute well, and were lulled by the numbers you quote above. Anyone using Symbian devices in 2009/2010 knew that this was inferior OS, waiting to fall dead. All pre-Elop.