I love the way people assume stuff will just die off. I mean, how many people still use a classic? The writing was on the wall in 1993 that the platform was on a hiding to nowhere and yet plenty of people still have them and use them now, 12 years later.
The future of the amiga is diverse and multifaceted. In 2010 there will still be OS3.x users, AROS users, OS4 users, MOS users and any other variants that have appeared in the interim .
I don't expect the overall userbase of any of the above will be that big (although I hope to be proved wrong), but I bet they will all still exist.
