Brexit will of course have an impact on companies like easyJet. It has already taken up legal time and costs just to assess the options before it. The chances are it will either obtain an AOC in another EU country or aquire another carrier based in the EU.
However the truth is nobody knows, because we do not know what the outcome will be in terms of European aviation agreements. Everything at this stage is a guess.
For me, a bigger worry at easyJet is the poor customer services department at the airline which stands to lose more customers at a time when it's short term costs may be on the increase due to the Brexit issue. It is about time some resource was allocated to resolve customer service issues.
As has already been stated, I don't think the calibre of those that called for the vote, or those that exercised that right, are relevent to this thread.