Maybe there aren't enough males reaching out for a privilege of being a MS and maybe they're loosing more MS in this ungratifying waste of time. They're already eliminated a mag attendant (not sure of the proper title), now less counting, it looks like they are simplifying work for MS.
In my experience few came in late for the talk and if anyone was to leave they would leave before the wt study. Also if my family was to be late for the meeting we wouldn't go at all so I'm just assuming that an average jw that miss the talk wouldn't bother going just for the wts study.
Counting taking place at odd times may make a push for more local needs talks as to how important meetings are so that people try to stay for entire 2 part meeting instead, but I doubt that would make any difference in regular jw. IMO numbers would have been higher if taked during the first half of the first meeting instead of the latter meeting. There maybe something more down the pipeline but at present I wouldn't read too much into this.
Another idea is maybe this is a small step to eventually eliminating number taking altogether which they could say they are using Jewish principal of not counting the vast multidudes because Jehovah isn't concerned about numbers which would eliminate the lowly dub from recognizing that the anointed numbers are increasing by the year and also that the general growth is stagnant or in decline. If the congregations don't fill the seats the KH will be sold off and congregations merged and the profits from the sale of the buildings will go to WTS.