The drawback to your logic is that we don't want Brexit in any shape or form, regarding it as as good an idea as invading Russia.Very true, even there you will find opposites. However, generally we did have the common-sense to understand that at some stage the talking has to stop and all attention needed to be focussed on the goal. Not a lot of point arriving at the station after the train has left? Let me make the point that such talking / discussion was actively encouraged, especially opposing views, on how best to achieve that goal and everyone with an input from across the board was invited. That done the decision was made and we all went away and did was agreed to be done, without question! To my mind that is the only way forward, the fact that you might not have swayed the decision with your input is irrelevant, at best experience and to be put to the back of your mind. To even think of continuing the argument by snipping and employing any other tactic would have consequences. BREXIT might not be a war but it is still needs opposing parties, in the UK, to come together if we are to achieve the best for ourselves - the politicians of all parties and sides need to understand this - quickly.
How on Earth would you "make the best" of a decision like that?
Answer
Cancel it of course, a total non starter, and the quicker that is realised the better