Out of Europe
For those who think this is another good reason for leaving Europe, you will be delighted to learn that the UK is almost certain to remain an EASA Member State even if the EU membership is terminated. The system would be too complicated to roll back to a UK-only licensing arrangement - and bear in mind that prior to EASA you had the JAA to broker the international agreements.
What do you propose should happen to the functional airspace block we share with Ireland? How do you re-write the agreements on airworthiness standards that currently exist between EASA and the FAA? Would you be happy to pay to have your ATPL converted to a stand-alone UK version when there would be doubt as to which other nations will recognise it?
It's not going to happen...