Forcing devs to implement two render paths is not good. It is better for Sony to create more work environment presets for future headsets, with default one being normal 1080p PSVR-esque. And if dev wants he can activate "extension" for accessing foveated sensors and more. That way all PSVR v1 titles will work fine on future headsets, always defaulting to 1080p mode which newer hardware will adapt to.