Sandy is this one of your KeikiPro experiments? I wonder if having too many Keiki's on a single spike stressed the parent and it's now aborting the spike. Maybe next time just apply it to a single node and see if that works. For now leave them be. They have a better chance attached to the parent plant than they do rootless by themselves.
That's why I haven't yet, Ross. But won't the chances of saving the keiki's diminish the longer I keep it on a dead spike?
If the plantlets don't have viable roots, they probably won't survive on their own, anyway. That's why I recommended waiting. Perhaps they might survice and root if moved to a high humidity environment like a plastic bag (out of direct high light.)