They simply cannot afford to wait.
To avoid other countries considering a possible exit from the EU they will push for the UK to leave as quickly as possible (under punitive terms) whilst at the same time they accelerate the integration - social, political and financial. They know that any delay will see a rise in anti EU sentiment - from Eastern Europe, the Netherlands, much of Scandinavia, and from within France itself.
This has been on the cards for some time and has been available for anyone who has been interested enough to do some basic research.
And this is the EU that Scotland wants to join????
"Scotland did not let you down. I beg you: do not let Scotland down now", Alyn Smith, MEP for the Scottish National Party