They will still be around. There will be those who just stick around for family and friends (they know TTATT but can't leave) and then there are those who know NOTHING else. We have family members who have NO life out of WT. No jobs or they are self employed. They live in there own little world. None of them have planned for the future (old age and retirement) so are now scrambling or worrying about their financial future.
WT will be a much smaller cult than is has been in the past but it will never go away. There is a sucker born every minute, so there will be those who are down and out in life that will gulp down the WT kool aid.