It would be interesting to re-visit this thread in a hundred years time.
I doubt if a united Ireland will come about in the foreseeable future but who knows for sure?
The North today isn't the country that it once was, and neither is the south. Things change. Times change. People change. Slowly, slowly, slowly... but it does change.
There was once a time, not so long ago, when the re-unification of Germany seemed an impossibility. Look where we are now.
After the Republic opted to remain neutral during WWII Churchill offered 'the principle' of a united Ireland to de Valera in exchange for the Republic joining the Allied Forces. But the offer was rejected.
I used to think it wouldn't happen, but sometimes a seismic event, like a revolution or a war can trigger things off in more ways than one. Maybe in years to come historians will see Brexit as the start of the journey towards to a united Ireland.
I think that aside from the economic arguments, a unified Ireland would attract a lot of 'goodwill, from around the globe. I believe that some of the costs involved could be offset in the medium to longer term by the benefits of being in a single nation able to function with a greater critical mass than currently.
Either way, it is more important than anything else that the peace continues.