So next few games Microsoft / Activision published, create a popular live service game then when it starts to reach its end (maybe after a sequel) get acquired by Sony for silly money but stay multi-platform.
The Bungie route 
In seriousness though, sad to see they didn’t want to remain first party for whatever reason (might still be some bad managers left in ABK atm?) but at least it seems they’ll still be published by Xbox / Activision for now so we get the benefits of their output and they get to be happy