travelling and wandering
Teams: KV Oostende, Rosenborg BK, Norway, Israel, Turkey
Impossible. UEFA has a clear rule that every member nation has to have an own league to keep its national team (this was the key reason why the Welsh FA finally established a national league in 1992). So if you merge the Irish League and League of Ireland, you also have to create an all-Ireland national team like in rugby and cricket. I cannot see that happen really.
It is nice to dream and all, but it is needed to be realistic. I bet none of those advocating an all-Ireland league knows that it would mean to merge the national teams as well. I also bet all those proponents of merging the leagues would change their minds quickly enough if they would know that it involves merging national teams as well.
I am not a proponent nor an opponent, but I don't see it happening really. I lived on both sides of the border, and I don't see any Irish or Northern Irish fan want to give up their national team. There is too much passion and national pride involved to do that. People should focus on the Setanta Cup as a nice cross-border competition and unofficial all-Ireland tournament, but officially merging the leagues is normally not possible without special permissions from UEFA which I don't consider realistic.
Also, there is not much point in the merger anyway. Linfield would be a strong candidate to win the newly formed league, but no other Northern Irish team would come close. An all-Ireland league would basically be the Eircom League + Linfield. Glentoran, Cliftonville etc would be mid-table at most. Only Linfield would compare to the likes of Cork, Drogheda, Derry, St Pats, ...