My biggest concern is that these are little terrariums dangling form a cable 30'-50' in the air.
No shade on them, some over asphalt parking lots, others over lakes/wet lands.
As others have pointed out, what happens when these things are stopped for 2 hours due to a mechanical issue.
They are going to get awfully hot awfully fast.
Ever sit in your car with the windows up on a hot summer day? How long does it remain comfortable? How long does it remain safe?
That to me the the biggest problem with the lack of at least a powered ventilation system or windows which open up, let alone a full blown A/C.
All it takes is for ONE incident to be a PR disaster.
Who ever is deciding to shave the bucks and not provide something which could help protect guests is a fool. One elderly person or infant who dies from heat exhaustion due to something entirely preventable will doom this entire project.
Penny pinching is not something which should be done, when guest safety is at stake.
These are likely to be some of the most used gondolas in the world once open, in an environment which likely can be dangerous if just s few conditions are met. Unlike the HK gondola (which has had its own share of incidents, including gondolas falling off the cable) the traffic on the Disney system will be higher, meaning the potentiality for an incident being higher.
Disney needs to rethink the "forced air ventilation" design.