I don't think game development will suffer due to brexit in fact it would make development cheaper thanks to hte dropping value of the pound. We might see a resurgence in UK development once we actually leave the EU.
It seems like one of those Studios that can't create great IP themselves but have highly skilled individuals to get the job done so to speak. Sony should have probably given them something from their IP portfolio to make an updated ps4 version.
Maybe its an accountant thing where someone at Sony has said decrease development costs by 10% and so they have looked for the easiest studios to close. The UK is more flexible and easier to make people redundant than the European mainland where shutting down costs would be higher and met with more resistance.
Maybe if they get to keep the development kits they could knock out some indie Sony VR titles.