In 2020 there are some very significant changes that will be forced on Members.
Adopting the Euro as currency will be mandatory.
There will be harmonisation of fiscal policies and closer political affiliation, an EU military force is proposed too.
So, yes...by the next election I think it might just be too late.
Read about some of the changes here.
https://www.telegraph.co.uk/finance/...-the-euro.html