Still trolling, are you? Strange "question" from someone who has previously claimed to live in Ireland (and, gasp, like it).
The Irish spent the better part of a thousand years resisting British domination and eventually had to resort to outright war to get rid of them. The one and only time the Irish State has even been in a formal state of war was against the British Empire, at a time when it (the Empire) was at the height of it's power.
And, as if the previous 7 or 8 hundred years weren't bad enough, that war (the Irish War of Independence) saw entire towns burned and pillaged by the British, as well as such atrocities as British troops shooting into crowds at football games (and similar acts of "collective punishment" that the British themselves condemned the Nazis for only 2 decades later); burning homes and businesses and then shooting anyone that tried to escape, as well as shooting the firemen who came to tackle the blazes; summary executions of anybody simply unlucky enough to be in the wrong place at the wrong time; the deployment of a paramilitary force against the populace made up of murderers, rapists, and other criminals let out of prison in Britain for that purpose (seriously; you couldn't make it up); mass internment of suspects; widespread (and generally) fatal torture of both combatants and civilians; and the imposition of martial law throughout the whole island.
After all that, why the hell would the Irish EVER want them back?
To paraphrase James Connolly (a wounded man who was strapped to a chair for summary execution by the British Army, as he was too sick to even stand up): "The British have no right to Ireland; never had any right to Ireland; and never can have any right to Ireland".
What's ACTUALLY going to happen is that, in light of the demographic changes happening in Northern Ireland, it will be pushing for unification with the Republic within a generation - two at most. And there's nothing you, or anyone else, can do about it. In fact, the Irish government - and their counterparts in the Northern Ireland Assembly - including Unionist politicians who basically 'see the writing on the wall' at this stage - have ALREADY begun the process of integrating the Northern Irish economy and wider society into the rest of Ireland.
By the middle of this century, Ireland will not be "reintegrated" into the UK (as if "joining" the Union was ever done by choice) but, rather, the entirely artificial state of Northern Ireland will be integrated into the rest of Ireland and, after nearly 1,000 years, the British presence in Ireland will finally be consigned to the history books as, thankfully, will people like you.