Used correctly Leury is a perfect guy to have on your roster with modern roster construction. The problem came when he was pretty much forced to start for a majority of the season. He's also found a way to be healthy this year, which has been a normal problem for him in the past.
The Sox seem to like Leury a lot more than Danny Mendick, so I don't see him being an issue, but it will be interesting to see what the Sox do with Romy over the next month. He has played something like 6 or 7 defensive positions as far as I can tell, and supposedly he is really good as a defender. If they think they can get that defense, plus a potentially better bat out of Romy, maybe the Sox look to save a few million and let Leury walk.