I'm sure "no stash at all" is doable, but my big question is - "Is it desirable"?
Lately I've been on a kick to use up a lot of what I have and eliminate the yarns I know I'll probably not use. It sounds like you're making great progress in paring down your stash, and that's very well done.
I have a lot of Caron Simply Soft yarn left in different colors, from doing afghans for the family, but there's not enough there to do that much with. I saw, in the Lion Brand circular, a rug made of huge pom-poms and that's how I plan to eliminate this overage, pom-pom rugs for the grandkids! They can even help make the poms!!!
But I'm already looking ahead to when I'll have all that wonderful free space available in my yarn cupboard and what I can put there!
I really don't know if knitters are even ABLE to eliminate their stashes completely. It gave me the shivvers just thinking about it! There's just something so compelling about all that lovely yarn...
Please keep us info'd on your progress! I'll love seeing what other knitters think about this!