Would be great if MS goes for WB Games. Sony doesn't seem to stop moneyhatting devs this gen or they even expand it if some rumors are true about FF and other games. So, even with their studios they bought the last years they still have to compete against strong studios from Sony, moneyhatted games and smaller games which release only on PS from time to time (from Japanese devs or devs who are just stupid and don't want to release on Xbox)
With WB they could compensate all of that and would be really a consideration for many PS owners.
MS said that they see Amazon and Google more as their competition but even then it wouldn't hurt to have such an advantage.