If it was that easy single days off would not have been in, in the first place. JB speaking at several groups of pilot, (ground schools ect ) multiple times stated that he had to have single days off to schedule the company. It always seemed to be his big ticket item. I do not believe the company would or will sign anything that takes the single days off completely. So if you can't get ride of them you try to restrict them which the TA does. Not perfect by any means. The big win on the single days is at least in the TA you can not only have single days off all month (which I have had)