X6, X3, N900, N97mini, XM 5800 Navigator ... there is not much connection between people using such different devices on different platforms like Symbian, S40, Maemo...
Now many people want a touch smartphone, it is easy if ONE device can have all applications, its OS can be upgraded Over-The-Air... and it is an easy choice for many, many customers to get that ONE device instead of going through a list of different devices with different specifications and different OS and apps...

So many people that want a touch smartphone will go with that ONE device HAS-IT-ALL: iPhone. No doubts about that.

Nokia needs that ONE device HAS-IT-ALL, and of course they can continue with other satellite devices.