To be honest, they could keep Minecraft on PS3. That would just encourage PS3 owners to look at a X1 as their next-gen upgrade.
The only platform they really probably don't want it on is PS4, that would help the XBox One a lot.
I think we could see a release structure like this for future Minecraft titles:
X1/360/PC/Windows Phone day 1, iOS/Android 2-4 months later, PS3 maybe 6-8 months later.







