Because it's simpler: All nations except the UK exit from the EU and create a new alliance
Brussel, London (dpo) - Then we'll do it this way! Because Great Britain apparently hasn't been able to conclude its orderly exit for two years now, the other member states have decided to walk another, less complicated way: They want to do an EUxit.
And this is how it works: Right on time on the 29th of March 2019 all EU member states, except Great Britain, leave the EU and create a new alliance of nations. The EU would then consist of only Great Britain.
The other nations would then form the European Alliance (EA), which works exactly like the EU except for the name.
"This back and forth is laming our institutions and has to be ended," this drastic step is justified by Pesident of the EU-Commission and designated President of the EA-Commission, Jean-Claude Juncker. "And if this is the only way to make a clean cut then we'll do it." He duly promises the EA would put every effort into keeping good relations with the EU.
Should the British still wish to exit the EU as the sole member state, this would not meet with many difficulties anymore. They could simply negotiate very
agreeable exit conditions with themselves without fearing opposition from Brussels.