In this week news on the mobile phone world there was also the announcement about Project Cider, to run natively iOS apps on Android:
http://systems.cs.columbia.edu/projects/cider/

It's a long shot before it will be out, and if it gets completed it will be probably shot by the attorneys of the Cult of the Golden Fruit, but I just wonder... if Sailfish can run Android apps, and Cider allows to run iOS apps on Android,
could Jolla be the ring to bring them all?