I hope the end of the Zaurus era means the dawning of another. Sharp has there fingers in a lot of pies (pdas, phones, dvd, dictionaries, lcd, etc, etc.). Sharp may possibly have a UMPC or similar type device up their sleeve that will carry a different brand name.
I can't see them abandoning this area of the market. I wouldn't be surprised to see a remodeled W-Zero3 type device. Be nice if it ran linux (Qt phone), but would likely be a Windows device.