If it puts anyones mind to rest I rode a gondola this weekend in Kuala Lumpur, think it’s pretty much the same as Disney’s Skyliner. Weather was 86° (real feel 98°) with 72% humidity, no air con and it was absolute fine on a 20 minute trip.
The seats have vents and the air flows from the bottom and through these to the top, if you have a jacket on it kinda inflates if you are sitting a certain way.
I also rode one in Hong Kong during quite a bit of wind and the gondola was pretty stable, no issues at all.