We know from android that multiple app stores on one platform does not solve the issue. That's why it's a mystery to me why that is likely to be forced onto Apple and its customers when the evidence suggests it will do nothing to improve the App Store competitive landscape.I'm not opposed to more OSs but I think Apple allowing more app stores on iOS would be a better/easier solution to the app store issue.
A good think about Android is that is provides more flexibility so even though it is technically one OS, the various phone makers can still customize it a bit.
Why not investigate and establish the actual problem and resolve that instead?