This is an inutile scenario/hypothetical, daler, for Catholics to entertain.
Again, we are not Sola Scriptura advocates.
Perhaps if you were on an evangelical Christian forum your premise would be a catalyst for interesting dialogue.
However, your hypothetical is useless for Catholics, for we do not distill our doctrines from writings.
Our faith comes from the Apostles, given once for all, to the Church.
We do not go by writings alone. We understand the writings through the lens of Sacred Tradition.
Does not Sacred Tradition speak of the Return of Christ? Does not Christ Himself say that He will come like a Thief in the Night? Does not Jesus repeatedly say to you: “Watch!”
Now for those of us who have arrived at a point where we believe the prophecies to have been fulfilled, we have a duty, as did the early Jews, Christians, and Muslims, to make known what has been given to us.
I would suspect that if, from the “top down”, those who hold authority and claim to be the repositories of the “Sacred Traditions” were to conclude, whether fulfillment was taken to be the coming of Baha’u’llah or someone else, that the “masses” would accept their conclusion. This, however, has never been the case in religious history, for the divines in every age have resisted the Prophets and Messengers, in “every case”.
Hence, for those waiting to be told of the Lord’s coming who expect and put their confidence in their trusted authorities, the wait shall be in fact “forever”, while for those who have been high upon the mountain of search and have claimed to see the dawning of the Light in its earliest glimmerings upon the horizon, these shall be amongst the few who first sound the alarm.
In the latter case, historically, these have also been the first to fall in their positions on the front lines of every Dispensation and their testimony rejected, their martyrs sacrificed, their bodies pelted with stones, or themselves been the recipients of insults hurled, at all times, historically, by “the faithful” of the past religious Dispensations.
All we can do, as declarers of the Light having dawned, is to make our testimony, and say, “We are you, yet from among you we have discerned that which was promised”