I'd be very interested in an open, smartish watch, if such a thing were made.
Priorities would be:
- Low power consumption - should run for months between charging.
- Focus on the original point of watches. Time. (see examples below)
- Be able to sync data with other devices, not just act as a terminal for them.
- Be able to run scripts in a well-known language.
Then, you could transcribe the local bus timetable onto your watch, write a short script to process it, and then get it to tell you when you have to leave work in order to catch a bus that will get you home before <time>.
If you have a calendar stored in suitable format on another computer, you could sync it with that computer over bluetooth when within range, and then the watch could remind you about appointments, even when your phone is out of range/battery/whatever.
It could handle recurring events too, again with user scripting - <event> happens on the 3rd and 4th Saturdays of each month.
It could notice that your last dentist appointment was more than 5 months ago, and remind you to make another one.
To me, that sort of thing seems a sensible extension of conventional timekeeping clocks.
Things I don't want my watch to do, mainly due to power consumption issues:
- Display full-colour high-res graphics. Seriously, who wants to view videos and photos on a screen that size?
- Monitor biometric data, or my position. If I wanted a tracking bracelet, I'd chuck a brick through a jewellers' window.
- Take photos. A lens small enough to fit in a watch is doomed to mediocrity, and the viewfinder wouldn't really be at a good angle.
- Be a mobile phone. The modules for phoniness are large and power hungry.
And some nice-to-haves:
- Audio playback. A wrist-mounted media player is quite a good idea, and both the decoding hardware and the flash memory are cheap/small enough now.
- Lots of buttons. A touchscreen is pretty horrible to use when made that small. especially capacitive ones.
- Broadcast radio reception.
Sadly, I don't think such a device is likely to become available soon...