Uniting the Northern Ireland and Republic of Ireland football teams would make a strong team. Combining two major football teams is a great way to make one superbly strong team. You will have more options for your team line up. Taking the best players for each position from each team to make your starting line up offers your greatest chance for a successful football team.
No, the football teams of Northern Ireland and the Republic of Ireland should not unite, because they are both strong teams, independent of each other. The two teams are both symbols of their regions. Both teams have loyal fans, and it would be a conflict of loyalties to combine the two teams. They should continue to compete as separate teams.