Yup, I always imagined this was exactly what they are going for. A big vehicle capacity allows for longer periods between dispatches without fully sacrificing total ride capacity.
I think there are 7 scenes total (with 4a and 4b), but then again those might be "half scenes" as in the vehicle doesn't linger as long. Taking the average of those vehicle sizes and snowballing something like 90 seconds spent in each scene, you'd wind up with a ten minute ride with a capacity of ~3000 people.
This has also lead me to suddenly realize something about ride times. Please correct me because I feel like I'm forgetting stuff here, but Universal has a total of ONE ride in the whole resort that I'd classify as "long" - Disaster. The next best thing is Dudley at IOA, which only hits 7 minutes. Everything beyond that is actually a shorter experience than Little Mermaid at MK. Disney has well over a dozen rides that are longer than mermaid.
Really, Kong is a much needed attraction that fills that 'je ne sais quoi' we so often attribute to rides for the whole family. Universal used to have a lot more of these experiences in the studios side, but systematically ripped them all out.