The Skyliners would likely be different types of gondolas than what would be used in the Magic Kingdom area. So, rather than look at Skyliner capacity, you'd want to look at max capacity of larger gondolas.
According to industy leader Doppelmayr, the max capacity of their largest gondola is 5,000 passengers per hour per direction.
https://www.doppelmayr.com/en/products/3s-gondola-lift/
I'm not trying to convince you to hop on a gondola. But, I'll point out that oldest aerial tram in North America has been running since 1976 (with a few periods of extended repair). It's the Roosevelt Island Tramway in New York City. In all that time, there have only been a few emergency evacuations and nothing has ever fallen from the "wire". I don't believe there have been any deaths or major injuries, either.