Here is my reasoning on this:
Many seem to think - and apparently the society has even stated now in so many words - that they wish to lessen the 'burden' on the brotherhood by elimination of the additional night of meeting attendance. Oh, sure, they threw out some bullshit about the price of gas - we all know that is a load.
But perhaps in a way they have seen a hole in the dike that we didn't perceive clearly? In an effort to do all the work required to be an elder, could it be that the society is actually driving some elders to the Internet? There are places on here that contain 'canned research', a Cliff's Notes version of the book-study, Watchtower, and TMS programs. With all the prep that elders are expected to do, could it be that some are being driven to the 'Evil Internet' for help?
How would a relatively Internet newcomer find such help? Type in "Book Study preparation Jehovah's Witnesses" once. See what you come up with. If this is the reason - and it may be part of the reason IMO - they are trying to protect themselves from an assault that they created by too much pressure on the already overworked elders.
I don't know where to find those sites that contain the preparation for those studies - but I have heard they are here somewhere. I would assume that many have heard that, but not knowing where to look, have found 'other interesting things to research'.
Just a theory.
Jeff