[snowwrestler]

This line of analysis can be followed for almost anything we have a word for. Anyone can draw a typical chair. Now start morphing it: the back gets shorter and rounder, the legs get shorter, more and more... At what point does it stop being a chair? And what does it become then? Where's the boundary between a stool and a chair? A chair and a bench?

The fact that consciousness, as a word, has fuzzy edges, does not imply that it does not exist. Most of our words have fuzzy edges.