Konstantin Obenland proposed the idea that Twenty Fifteen should be a simple theme. Take _s and just add CSS. While that is a noble idea, I think we could also challenge ourselves to rethink themes completely for Twenty Fifteen. Since Twenty Fourteen was released early (Before we even hit Twenty Fourteen!), we have plenty of time to be experimental.
Maybe this is just a crazy idea. I don’t know. But I do know that we as a community can challenge ourselves to build something amazing.