Sadly we likely won't be able to move any of our OF but Inciarte for any real return. But I think if we can get a bag of balls and some salary relief we should jump on it. Markakis and Kemp likely hold value to someone who needs a piece and doesn't have a ton of money or want to trade a valuable prospect or young player. We could probably trade one of them and half their salary and get a fringe prospect back or a solid reliever.
That being said, I'm not optimistic, the time to trade Markakis was after his first season and we never should have made the Olivera trade so we never should have gotten in a place to have Kemp on this team. We're now stuck in this bad situation where Kemp and Markakis are old and have no value.