I don't know what happens with the Sony ports but they all seem to get so far and then whoever does it gives up.

But, I think the problem with any existing device is that they tend to be phones that have been relegated to the drawer by a newer model so they're already not a person's daily driver.

Sony used to sponsor porting efforts for Firefox OS IIRC. Perhaps we need to get hold of someone at Sony and see if they're up for throwing some cash at getting a semi-official Sailfish port to get this rolling on their hardware. Perhaps someone in the community (ex-)Nokia or (ex-)SonyEricsson has an idea?