In addressing the question to the wrong person, you miss the point, which is that
philosophical is saying that it is up to Leave voters to solve the problem. Let’s accept that’s correct (it isn’t, but let’s accept it is in order to move on), how is that to take place? Leave aside the uniqueness of the suggestion within the terms of our system. But given that he keeps on saying that this is what must happen, it’s not unreasonable to enquire
how.
For what it’s worth, I’d opt for a reunited Ireland. If I was the Westminster government, I’d say to the Unionists “we have decided there are two choices: the sort of border you don’t want, or no border, because you’re joining the Republic. You choose”.
That would appear to be the honest position of Johnson. He should just say it.