Of course they were aware. Prolonged closures are not awn unknown and there is no way to guarantee they will not occur. They suck but people survive just fine even when it is hot outside. These are not a sealed box like the monorail, which people also survive prolonged closures without people yelling about how monorails are unsafe and outdated.
That is was off cable is meaningless. It was at an area where all of the gondolas must transit. Something caused gondola 108 to not move onto the cable, something that could have occurred with the next gondola if they just moved to restarting the line.
It was no longer the Disney employees' call when the collision occurred. An incident automatically triggers the involvement of the building department.
Is this a big concern you have with roller coasters? Someone with a fear of heights could get stuck on one. What about elevators? Someone with a fear of heights and confined spaces could get stuck on one. The monorails? People have called 911 about being stuck on Harry Potter and the Forbidden Journey. How many different irrational fears need giant warnings on everything that could be a trigger due to unplanned occurances?
This. People were stuck on the monorail for over an hour a few weeks ago and literally had to wait for Reedy Creek cherry pickers to come remove them a couple weeks ago. It got so hot on board (no cabin ventilation there) they popped open the emergency hatches.