I think the witnesses would react just like us JWDers have reacted with Simon's announcement.
They would cuss and discuss and speculate, then many would splinter off quickly in a hurried effort to join another group and choose a name like "Watchtower Lite" or "JW II" or "The New and Improved JWs" where they would debate the whys and wherefores of the WTS and what went wrong. There would be weeks of discussion about the various leaders of the old organization where some would openly criticize and condemn their leadership and motives. Some would join the group where their trusted elders went. Some would hold fast for the five months then just drift away into oblivion. Some would probably leave immediately and never look back...just focus on living life day to day. Some would probably have a psychological meltdown and flounder back and forth in an effort to recapture what had been before then upon realizing you can never rebuild something exactly as it was, sadly settle into acceptance of what is.
Great fodder for a paper on cyber sociology, imo. It's been interesting to watch the various personalities, don't you think?