Didn't they foresee that their movement would grow past 144,000 members, so they had to change doctrine?
By the way, many mainstream Christian churches believe that someday, after first residing in heaven after death, people will reside on earth, when earth is made new and the tent of God will be with his people. But witnesses are the only ones who take 144K literally and believe in two different hopes. (The one faith one Lord one hope thing I guess fell on deaf ears that time).