FGS,
It is not so much a doesn't fit. The current exercises are in line with the aircraft flying on designated routes.
New exercises will have to be designed to have the aircraft in 'free flight' and the new dilemnas that may bring up.
Current sectorization is built around designated routes, and there are usually defined boundary positions. With the advent of free flight controllers will have to be alert to the different co-ord requirements that may be required.
As such I have heard that these new exercises for some sectors have not been developed yet. There may be issues that haven't been considered in full yet. e.g. myriad exit/re-entry flights that may impinge on automatic ESTs , Hand-offs etc.
Or it may work well? Heres hoping.