For the moment, all Sony need to do is make sure that all PS4 games work on the Neo and that it doesn't require a small patch for it to work. They need to make sure that if consumers buy the Neo they can play all their PS4 games on the console. If they can do that, then Sony are fine.
Microsoft have effectively announced their Next Generation of Console, yes it works with all Xbox One games, but in short it's such a large leap that it has to be considered to be Next Gen. In addition to that, in 18 months time when Scorpio comes out they will want games that sell the system. There needs to be Exclusive Scorpio games to make people sit up and buy the device. Microsoft have also stated that in 18 months time, the Xbox One is dead. There is no other way to look at it.
Sony on the other hand is releasing a 2X powered PS4 that will allow for enhanced visuals. They have already stated that all games need to be developed for the PS4 first and foremost and developers can add extra effects and higher resoutions for the Neo version.
The big difference between Playstation and Xbox is that there are no real Exclusives for the Xbox now. It's all Xbox & Windows 10 Exclusive. So gamers that own a PC, will see no need to buy and Xbox as all the games will be cross platform. Playstation still has exclusives for the device. So you will have to buy a PS4 to play the game.
The way things are moving, it seems that over the next few years we will see numbers of Xbox Console owners going down, what we may see is those consumers that normally have both consoles will go for the Playstation and invest in a PC instead of getting an Xbox. So will the Scorpio be the last Xbox home console?