The answer, of course, to the "If it's a positive TL, why rock the boat?" question, is a matter of balance. Is it one of your older accounts? Then you may want to leave it open for AAoA. Was it a high CL? Then you may want to leave it open for lower util. If neither, then if you don't have much else, you may want to leave it open in hopes they lift the restriction at some point.