Bungie isn't massive, it's bloated to the gills with adult day care jobs and nepotism. They are going to be getting gutted one way or another, either out of necessity or by Sony's hand. And honestly it's been a long time coming.
That's why's I think Marathon will get dropped. Bungie needs to tighten their belt financially and focus on a product that makes money now while also preparing for the future. D2 getting an AoT will keep them afloat, D3 in 2.5 years will print money. Double and tripling down on marathon will kill the studio, and Sony is too invested to let that happen now.