They will never stop having Meetings or gatherings.
The Group-Think is too valuable to reinforce the believers.
Gathering in a group with others is the KEY way to make people feel accepted and part of something. It is the best way to reinforce behaviour and quell any doubts or questioning. Just seeing your "friends" all doing the same thing, and "learning" the same thing will ensure no-one wants to break ranks.
I doubt they will ever phase out meetings in some form or another.