First of all microsoft would never do it. They will maybe do it for rocket league only because ps4 players have been playing with pc for a long time, but for now they just want to look good in the headlines. Sony i hope won't do it because that will be a huge plus for xbox but a bad thing for ps4: xbox one has very few players on online games but with ps4 players they would have no problems. Ps4 has already more than enough players but joining with xbox the appeal of way more players in mp games goes down the drain making the effectively xbox more desirable while ps4 less desirable. It is a very known issue the one that xbone has few players in their online games like in mgs5 and bf hardline which were graveyards at launch and had less players than on ps4 right now after these games lost the interest of people.