Are you trying to take the cake for pie in the sky modeling of current events? You'll need to do better; Trumpians are far in the lead on that score.
Speaking as a "Continental," I'd say the mood and objective on this side of the Channel has been clear for a long time. Out means out, not harshly, not with a kick in the rear, but out. What there is to negotiate is how to work out any issues arising from the separation, and close out the arrangement. After that, it's generic WTO rules. Moreover, thanks to Trump and Putin, the EU is recalling its role as a guarantor of freedom and security, and in no mood to make concessions that would harm its own cohesion and purpose.