Nope!
Many other Orgs, religious/political and otherwise, have taken severe hits in the past, then they rebrand/evolve/merge/whatever and continue on.
These SOBs are going through a whole transformation now; we the old and disgruntled due to their failed promises/prophecies will die off or fall away and the newer version will remain and continue strong as ever, under new management/policies so to speak.
Look them up 20 years down the road, still alive and ticking.
DY