The Irish can well afford to say they do not want the North as long as their chances of getting it are pretty slim anyway.

But if that reality were to change, I'm pretty sure public opinion in the Republic wouldn't be objecting too strongly.

I'm sure there would be many arguing that the costs would be well worth it.

I guess maybe even the Unionists could be placated if the Repubic were to write some special protection such as elements of self rule into their constitution (in the same way various other European nations have such arrangements for minorities).