It shouldn't be that radical to suggest that maybe, if the deal on the table for leaving the EU is rotten, it might be better to stay after all. It should just be a question of where the line is drawn, rather than whether it exists. In practice, I expect that a relatively sensible deal will be reached, and the issue of reconsidering the referendum decision won't come up -- or at least, not as quickly as Tony Blair appears to be envisaging.