Do experts think there will be any way of knowing if a wormhole is about to close, or should explorers just err on the side of caution?
Yeah, the SOL Corporation is actively studying these events and will issue an update to all Nav computers, that will warn captains of the stability of the event.
While in the vicinity of the event, the nav computer would be able to estimate the if the event is "stable", "unstable" or "critical". Each state will be related to a time left to the life of the event.