Nothing is certain yet but if we actually leave EASA it will make licencing much simpler. The NPPL and UK/EASA PPL will merge into a single UK PPL, simplifying medical requirements and getting rid of silly EASA limits such as microlight hours not counting towards a full licence and the 100 hour minimum on converting foreign licences.
The elephant in the room however is the lack of qualified staff caused by delegating so much responsibility to EASA. It will be many years before some tasks such as aircraft certification can be returned to UK authority.