I believe that Sony will continue to acquire development studios that fill a gap/void or that fits in with what they're currently doing. While some may disagree, I don't believe that they will acquire any publisher simply due to the fact that they would be losing the 30% cut made from all game sales from that respective publisher and this is something I don't believe Sony is willing to sacrifice.
Flawed logic. If they acquire a publisher
- And decide to keep things in house they win the other 70% in their platform, losing competing platforms revenue
- If they keep their publisher 3rd party, they still win the other 70% from sales in their platform and don't lose 3rd party platform revenue