They will keep doing what they were doing before(and improving upon it), and they will still beat MS.
Honestly, I don't understand this MS x Sony. Microsft and Sony biggest competitor was, is and always will be Nintendo.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.
https://gamrconnect.vgchartz.com/thread.php?id=241866&page=1