You really are a troll. Symbian is great. For a decade it was the only mobile OS worth considering. It still is the most widely used smartphone OS in the world. Sadly, time has gone past Symbian. Even so, Belle is the best UI out there, but the core OS is too complicated and time consuming to maintain compared with other OS'es.

Market share only shows current sales. Nokia hasn't made any top Symbian phone in the last year and a half since the N8. That is why Symbian is declining so fast. That is no mystery. The real question is why isn't WP climbing faster. The future for WP is not all black, but it's not exactly bright either because Android is like an unstoppable locomotive gaining more momentum every second.

WP/Nokia may actually squeeze iOS quite a bit, but against Android, no chance.