Comment 8 for bug 907675

There's not much point arguing about the formal Importance of this bug. The reality is that we have the following chain of dependencies before we can fix this:

 1) upgrade Launchpad production to xenial (in progress)
 2) convert Launchpad build system to pip, so that we're no longer blocked on upgrading Twisted by conflicts between zc.buildout and pbr
 3) wait for a version of Twisted to be released that supports ED25519 keys
 4) upgrade to that version of Twisted

We already consider 1) and 2) to be high-priority, but 3) is out of our hands for the time being. Debating the value of the Importance field isn't going to speed anything up.