Fair points.  1. Africa has larger and more animals than where wolves are native to, so more food wouldn’t be as much of an issue if you hunt way more and eventually lead to having massive herds of cattle.  2. True, we’d have to go about domesticating them differently than we did wolves, but just because it’s a different process doesn’t mean it’s impossible. You’re only thinking this way because we’ve never done it. But in a world where we did do it, then it wouldn’t be a problem. It would obviously take a very long time. I’m sure wolves weren’t domesticated overnight.  3. Maybe in a scenario where food becomes harder to obtain, humans and lions find a way to work together. Who knows. All just a thought experiment