A new framework like SpriteKit requires at least a year (an iOS release cycle) before it sees WWDC ... and then a shipping iOS. My recollection is that this is pretty close to the timeline I described where Cocos starts to show up in abundance in the iOS apps submitted and as a result a team is spun up at Apple to create what ends up being SpriteKit.
You'll have to educate me on the plateauing of Cocos. If it did plateau pre Sprite-Kit, what replaced it?
It’s not. Cocos got popular in the iPhoneOS 2.x days. SpriteKit came along in iOS 7. We’re talking about a period of five years, not one or two.
> If it did plateau pre Sprite-Kit, what replaced it?
Plateau means it stayed flat, not that it went away. Nothing replaced it. It just didn’t keep getting more and more popular.
I’m not sure you can point to Cocos as a motivating factor for Apple, and it certainly wasn’t sudden. It got popular very early on and plateaued. I remember building apps with it for iPhoneOS. SpriteKit didn’t come along until years later.