...it will be interesting to see what percentage of its user base Apple disenfranchises when it does go.
I'm not sure how you'll find that out, other than anecdotally.
I imagine Snowy users, like Motorola 680x0 Mac owners facing OS 9, or PowerPC Mac owners facing Snowy, will mostly bite the bullet and buy new hardware, but some will leave the Mac world in disgust, and some will keep on keeping on until their current hardware breaks, not needing the benefits provided by newer hardware and the software it requires/makes possible.
