There will always be something new around the corner.

First you have to wait for the N9 to be announced.
Then you have to wait for it to actually ship.
Then you have to beta test the new device & OS, and wait for developers to write software and bug fixes.
And, for all of that, you pay a premium for being a early adopter and going along on the mystery roller-coaster ride.

OR
you could get the the N900
available right now
at an extremely attractive price
a great device, with most of the bugs ironed out and works really well
lots of great stable software
you know exactly what you are getting (and if there is any key feature or application you really need that is missing)

Could you use the N900 as a wi-fi hotspot, or do you really need to connect to the internet through bluetooth?

I only bought my N900 a few months ago and am very happy having waited for software, bug fixes and discount pricing (evening knowing that it is the end of the road of Maemo - it'll give me time to sit on the fence and see how 1st gen Meego devices turn out before deciding whether I'll hop in at the start or wait for 2nd gen (more likely for me)).