It allows the UK to vacate the structure of the agreement in Northern Ireland if it does economic or political damage. And that's exactly how the EU has used the Brexit agreement: to try to lever Northern Ireland and its economy away from the UK.
Northern Ireland is a voluntary member of the United Kingdom. So to attempt to damage the connection is concerning. Article 16 protects the will of the people of Northern Ireland.
Eire (ie the southern part of the island of Ireland) stands to lose the most if the EU decides not to compromise. A trade war destroys their economy. Their problem is that they aren't directly connected to the EU. And so they rather depend on the UK's goodwill as a means to connect Ireland with the continent.
And Germany's car industry would also be badly affected by a trade war.
France owns various power companies in the UK. We'd nationalise those, of course.
So I doubt very much they will play that card.
What they really need to do is to respect the fact that Northern Ireland is part of the UK. But they are always up to something. Usually because they are afraid other countries will want to abandon the so-called European Union.
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