Remember that good, reliable gondola systems have been around for over 50 years worldwide. Even DIsneyland and the Magic Kingdom had them operating between their respective Tomorrowlands and Fantasylands. And they were quite popular. As to why this happened, rather than happening during testing, who knows? I'm sure they will find an answer, and modify/repair it as necessary. I do remember seeing the gondolas at DIsneyland stopped for over an hour once, when I was young, in the 1960s.
I agree that they should have had a better, more efficient evac plan in place. But for some reason, they didn't. I'm sure the riders were extremely uncomfortable and anxious waiting for the evacuation, to say the least.
For those saying Disney should not use outside contractors to design systems and design everything in house...they have been using outside contractors since day 1.
Accidents happen on any transportation system, remember there have been monorail breakdowns, a crash and a fire over the years, too. The busses have similar issues. It will be interesting to see if this is a design flaw with the gondola system, an issue with swing tolerances leaving the stations, a defect in materials, or human error. For all we know, it could be a simple loose or defective mounting bolt. I'm sure the manufacturer, Doppelmayr, already has a team en route to Florida from Austria to determine the cause. Doppelmayr has been around since 1892.
The two companies have their work cut out for them determining the cause and coming up with a more efficient evac plan.
The first gondola cable system in the US opened in 1957 and worked reliably until it ceased operations in 1999.