Given that anyone born in Northern Ireland can choose between British nationality, Irish nationality or dual nationality, I’d say they have more choice than most of us already. Good for them, I’m rather jealous.
I don’t expect to see this resolved in my lifetime (unless Brexit goes badly wrong, either politically or economically) but as long as it stays peaceful that’s enough.
I'm jealous too. Based on my surname, I almost certainly have some Irish ancestry, but haven't been able to trace it so far. I feel quite strongly about the case for a united Ireland, though. If Brexit accelerates the process, at least there will be one positive outcome.