@Zephray I've heard nothing back yet, but I'm going to keep checking. Wouldn't hurt if we all twitter bombed them until we get an answer.
There is hope that the insert songs (like Dear Friends) might still be dubbed, because the Korean Dub of episode 312 just aired a couple of months ago and they were able to dub it. I think the rights for insert songs are different than regular openings and closings, in that they are treated like BGM (background music), but we'll see.
But now that I think about it, we've actually had A TON of songs dubbed for One Piece. 4 openings, 13 endings (+an extended version of "Memories"), 1 insert song and 1 movie ending. That's 19 songs! So we should be appriciative of what we have already. Even the whole Dragon Ball franchise only got 12 songs dubbed. That's quite an accomplishment from Funimation I've got to say.