Answers to Questions by Yair Davidiy
Are there chances of Ireland rejoining the UK?
https://www.quora.com/Are-there-chances-of-Ireland-rejoining-the-UK/answer/Yair-Davidiy
Ireland would never join the UK.
The UK would not particularly want Ireland.
Nevertheless a scenario could emerge whereby the two nations come to an arrangement in which they de facto merge with each other
for an interim period. After that it may become formalized.