Well, I'm too old for it to mastter but my 3 kids have cashed in their Golden Euro cards (mum born in UK of 2 Irish parents) and are all now pukka Irish so they're safe.
As for the bitterness to last long term I'm not convinced it won't die down in a year or two because one thing's certain: this country won't try it again in a hurry - like 2 generations at least!