I think I said this many times before with the disturbing possibility that if Irish were to be adopted en masse in parts of Continental Europe we could see a serious resurgence in Celtic culture not seen in centuries.
That they could end up taking Celtic cultures more seriously than the British Isles do, which is where Celtic cultures survived the longest. Heck, their ancestors were historically Celtic even if they would’ve spoken Gaulish rather than Irish.
They’d learn and speak Irish out of convenience though that would mark the first time a Celtic language other than Breton is spoken a lot in Europe not observed since antiquity. It could already be happening, it’s just baby steps at this point.