I think this is quite a smart subject:
I am one of them who will finally retire my trusty N95 (1st gen). and I definitely belong to a MINORITY user group as I use more or less all functions and services the N95 can offer, VoIP , Skype, Router ( Joikuspot) Bluetooth Headset /sync, 16gb SD, Video rec, Gmail, Chat.....

I have seen Grannies with an N95 (and up) phone most likely only using them to call with. the N900 will be a bit to large in size ( even for me) and to expensive.
the iPhone still have this "bling" attraction making people to buy it even if they just will make calls / sms

N900 = mass market = NO
this is my personal Scandinavian Techie opinion.