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the amount of people applying for Irish citizenships could very well increase again!
So this is an interesting fact btw: it depends on how the tuition fees are determined. For example, in my experience some people have the misconception that as a UK citizen, you will pay home fees by default. Unfortunately that's not true - as it stands, where you've lived trumps your citizenship. I.e. if you're a UK citizen that has lived outside of the EU for too long, you're shit out of luck and paying international fees.
I think it works the same in Ireland, so you need to have lived in an EU country for 3 out of the last 5 years - even if you have Irish citizenship. So for the short term, having citizenship but living in the UK would help, but in 2 years, that'd be over too (if you're just living in post-Brexit UK).
I imagine that they'll have to pay the higher fees.