Yes, I would buy one. If only to have a proper phone like the N900 that I could use for many years to come.

As I don't see any other devices around the corner or coming in the next few years and nothing out there capable enough to do anything more then being a lousy-phone and playing angry-birds. (i-phone, android looking at you guys)

The N9 looks like a very sweet device, but, not sold in my country (or most of the big European countries) and it has no keyboard.

The keyboard, like it is on the N900, is vital for serious work on the phone. (business and professional style use cases)

Typing email longer then a few words without spending hours, writing minutes of meetings, doing remote work on servers (ssh / vnc / rd) from literally anywhere on earth is what made the N900 such a great proper smart phone usable for business people, professionals and consumers alike.

Without a follow up on the N900, I will resort back to getting myself a dumb phone... that will do weeks on a single charge again and will have clear reception everywhere.

Because seriously; the rest of the phone features are just not interesting if you need to bring a net-book or alikes with you anyways for serious work.

(I have an Android tablet and although it's way bigger then my N900 I cannot manage to reply to an email with more then a few words... it just takes too long... the virtual keyboard is not responsive enough and holding the tablets for a long time is painful and uncomfortable)

This all IMHO ofcourse