I think its obvious that Sharpe have totally abandoned the Z. But, really, does the fact that the Z has no "official" commercial support REALLY matter that much? After all, the Commodore Amiga has been commercially dead for over 12 years now. There is virtually no commercial interest/support for the Amiga, yet it has an AMAZING vibrant community full of people still developing for it.
I think the Z will head the same way, it will continue to grow under its own steam and it will retain those users who truly love this unique platform. The Z will go down as a "classic" computer in time and if you take a look around at other, older, "classic" platforms (such as the Amiga, C64, Apple Newton, etc) you realize that there is no fear for the Z's future. Those who love to use their Z's will be able to do so for MANY years to come, despite the lack of commercial support. The Z "community" will keep it alive if it is strong enough (which I feel it is)
All this talk of a "Zaurus replacement" and this apparent manic obsession with OTHER (newer) devices seems to be coming from those people who simply crave the latest and greatest. Which is great, for them. But, personally, I love the Z for its unique design and really do not think any other device (including the N810) could replace the Z.
There is pretty much NO hope for the Z to be a commercial success again, I think. We should just accept that fact and begin to appreciate the Z for what it is and focus on creating our own system of support and development. WE DO NOT NEED COMMERCIAL BACKING TO MAKE OUR Z A SUCCESS!!