Wasn't it just slightly before the organisation reassured and explained wider this co-existing generations thingy. At least for me the purpose of the book study at home was explained as precaution for forthcoming persecution. When this would happen we would only meet in private homes. As it was obvious that the end wasn't in such near future as was thought earlier, they could temporarilly simplify things and get rid of meetings in private homes. Be certain than when the end is really really near again this arrangement will pop-up again.
CP