Pilots will correct me, but I think the speed / runway distance during an aircraft's take off at which it is no longer possible to abort is termed 'V1' - once reached, the only possible course of action is to continue the ascent, even if an emergency landing is made immediately afterwards. The question facing us all is whether Brexit has reached 'V1'.
There is a concerted remainer media offensive this week; AC Grayling continues his painful public meltdown and so is deemed unfit to face the camera or microphones, but Andrew Adonis has already delivered a rather hysterical and disconnected plea on the 'Today' programme to abandon Article 50, and today on R4 the Great Dissembler, Blair himself, did his utmost to advance the several specious arguments that remainers use to justify reversing the referendum result. Not only did Humphrys do a reasonable job of taking these apart, but Norman Lamont, the poor badger in the Treasury when Soros mounted his financial assault on Sterling, demolished as fatuous and risible Blair's arguments, concluding that his reasoning was 'completely fraudulent'.
When I read what remainers want to reverse and return to it is the EU as it was before 23rd June 2016. This was eighteen months ago; if a week is a long time in politics, a year is an eternity. The past is a different country. Even if Article 50 were reversed, it is simply not possible to go back to 2016. The EU has already moved ahead; the EU army that remainers poopooed is in formation via PESCO, sweeping presidential powers are in preparation, an integrated Finance Ministry is gradually winning German acceptance, Macron of France and Schulz, likely soon to be in coalition government in Germany, agree that a United States of Europe should be the goal within eight years. If we seek to return now, not only will we lose the budget rebate but Brussels will demand that we adopt the Euro. It is simply not possible to go back to the way things were in 2016.
All of which suggest to me that we have already reached V1. There is no longer a 'remain' option - only an option to join anew a completely different EU.