It's very possible that their home console department would earn more but I don't consider developing for PS4/Xbone/PC a good option.
- Profits could increase, yes, but it would come at the cost of having control over the hardware.
- As long as they have their portable consoles it would make more sense to simply ditch home consoles altogether and move resources to their handheld systems.
- If it's all about the money I believe going mobile would be more profitable than going for other Playstation and Xbone.