The Backstop prevents the imposition of a hard border and maintains free trade.That scenario hasn't been mentioned before here, its a good point.
I'd say that could work for Boris. Farage might even resign and retire (again) and 90% of the Brexit party could disband. Leaving a lot of grateful floating votes for Boris to scoop up.
The 26 EU states would be delighted to see some sort of deal and an end to the whole saga, so they would jump at the chance. Including Ireland, because we would be in the worst position of all.
With the EU imposing a hard border, and tariffs to all north/south and east/west trade across the Irish sea, we'd probably be facing a general election by then ourselves.
Varadkar and Coveney will never really lose though. The worst case scenario for them is some plumb job in Brussels. With full ministerial pensions from the Irish taxpayer to top up their EU salaries.
Is that not the whole point?