Personally, with both the Natami and Replay boards nearing completion, I can't see myself buying a classic again other than for the case and keyboard (I'd love being able to stick a Replay board with the 68060 daughter board in an A1200 or even A600 case if it'll fit...). But that's probably since my sentimental attachment to the actual hardware has had quite a few years to cool off.
It'd be fun to have one, but I just can't see enough reasons to justify it compared to getting new compatible hardware.
But I'm sure lots of people who already own them will hold on to them as best they can no matter what...