Nokia is re-releasing their 6310 phone this year and honestly I'm more tempted to go down that path at this point. Just a regular, reliable phone. The most painful thing for me at this point will probably be authenticator apps.
That said the pine phone looks really cool and I hope they succeed. Mobile Linux is going to be such a large uphill battle without huge investments. But with Google/Apple having compensation packages amounting in the 300k-500k+ per year you'd think there would be room for a competitor in there somewhere.