Is it the thought that the UK will leave the EU without a deal, and the UK will not remain in EASA.
The UK wish to remain part of EASA although there are contingency plans for the CAA to take full control again should the EU decide not to allow the UK to remain a lower tier (associated) member.
In common with all EU negotiations it will go to the wire. Look at Greece on the verge of crashing out of the euro in July 2015 owing €320bn at that point.
It will eventually all implode when they finally recognise "the Emperor's new clothes". It will effect everyone worldwide.
Thankfully the UK kept the Pound Sterling.