A couple of things...
1) I think they will still have "bookstudy groups" in the sense of an elder being assigned a group of 15-25 publishers he "cares" for. Too many of their arrangements (post-disaster recovery, shepherding, field service arrangements, hospitality for the public speaker, turning in your time) are all tied to it. My guess is there won't be a single "bookstudy conductor" (I know, they changed it to bookstudy overseer, but without the bookstudy arrangement in the homes, you're going back to conducting a meeting at the KH). Rather, the existing BSO's will take turns conducting that meeting at the KH, on a weekly rotating basis. I wonder if they'll skip reading the paragraphs? Much like the WT is done when the CO visits (which is a whole other thread anyway, isn't it?!)?
2) My wife (still in) is surprised, but thinks most families will embrace gladly the change and be relieved at one less meeting per week. Then she made an interesting observation... she's been expecting that in the near future they will cut the District Convention back to just a two-day event, Saturday and Sunday, to help the friends with travel costs, not having to get time off work, etc. They've already shortened the program days... we went from 7 days to 5 days to 4 days, to 3 days, to 2.5 days, why not make Friday just go away all together and save the friends an extra day of hotel/travel costs and give them back a day of pay from their jobs?