I wouldn't all go getting too excited about paying tax in Ireland if you actually live in the UK. HMRC will still get their pound of flesh irrespective of where you pay tax and NI if you cannot demonstrate that you are domiciled elsewhere. If you have a house, family, other interests here and cannot prove that you live abroad 'full time' they'll deem you resident and send you a bill.
As others have said, it won't be before time for those rooking the system. Two things certain in life................