I dont really think they are going to Change back to the Old Player vs Player combat system, That would make all there Hard work put into 1.9 completely useless. I know many people dont like this change, But Updates and stuff are what keep the game going, if they stuck to regular survival like it was back in the beta days without Anything new or exciting to use in the game, It would get boring very fast. No Updates= No Money Switching back to the old combat system=More Complaining from the MC community who actually liked it and all the Hard work wasted on bringing the purpose to 1.9 Mods, Adventure maps and Updates= Lengthening the Lifespan of Minecraft and to get players coming back for more, Plus more monetary revenue for Mojang and Microsoft. To sum it up, All these 3 things i mentioned is what keeps Minecraft on its feet, and it definitely wouldn't be the same without them.