Considering options at the Crossroads.
First and foremost the people of Northern Ireland who understand how bad this Withdrawal Agreement really is for our economy should find a way urgently to shout loudly in collective protest against this. The powers-that-be will resist such calls, but it's worth a try.
A Border Poll would be the same thing as a 2nd EU Referendum for the people of Northern Ireland: the notion of a Dublin-controlled united Ireland is currently not an option. Ireland is currently part and parcel of the EU Project and is essentially governed from Brussels.
A 2nd EU Referendum only makes sense once the whole of the UK has left the EU for a number of years. In the 2016 referendum the British people collectively instructed government and parliament to deliver an exit from the EU. If that result cannot be respected and implemented then democracy as we know it is dead.
So, Plan A would be to implement the above action of applying pressure at every level to urgently alter the NI Protocol. This could be followed up a few years later with a Border Poll/2nd EU Referendum should there was a popular demand for such. This would demonstrate proper democracy in action: once Brexit has been implemented for the whole of the UK, with adequate time allowed for testing the economic advantages or disadvantages.