I think there's enough of an audience for a small (4-4.5"), high battery life (5-7 days... or more), simple (email, SMS, messaging apps, basic navigation), open source phone, based on the general sentiment I've seen here on HN. No need to release 5 new versions a year and expect users to upgrade every year -- I'd happily shell out $1000 every 5 years, and only expect version updates every 2-3 years for this kind of phone.