Republic must follow UK and get out of EU
It seems to me that the solution to the vexed question of the future of the open border is quite simple.
Since before 2014, the Republic of Ireland has been a nett contributor to the EU coffers, with each citizen currently paying over €100 per year for membership.
This contribution will undoubtedly increase substantially hereafter, as the EU loses the United Kingdom contribution and it takes on another four underdeveloped countries from Eastern Europe.
The days of the Celtic Tiger, subsidised by the EU, have long ago come to an end and, increasingly, Ireland will be the subsidiser.
The Republic joined the EU on the coat-tails of the UK. Their economy is linked predominantly to the UK.
They should now follow the UK to the exit, or accept that the open border will be closed to protect Schengen.