...I don't think that you need to have 80 GBs of music on you to be a "true music fan". I get along just fine with my 8 GB Nano... and I'm a true music fan.
I think they should replace the Nano with a small, multitouch iPod similar to the touch, and make the iPod Touch's with an HDD and make them a bit thicker, and axe the classic.
But that's all still personal opinion (like my statement) and others will disagree. The Classic will be here for many years to come. If Apple does give it the axe there will be a lot of upset music fans.
Plus, putting a HDD in the Touch will make it unbearably slow.