Over the recent months there have been many changes and shifts that have altered the landscape of the political battleground, because of these it could be possible that Northern Ireland could see a Sinn Fein/DUP coalition Government.
As mentioned in the previous post on this blog, The DUP and Sinn Fein appear to have figured out a way of peaceful co-operation, which has been allowed to emerge thanks to the SNP victory in Scotland and the Republic's Economic problems. The nature of the relationship appears to be the the DUP will focus more on British Constitutional issues and handle Northern Irish Economics, while Sinn Fein focuses on Economic issue in the Republic and social issues in Northern Ireland, thus allowing both parties room to shine and opportunities to work together without unnecessary confrontations.
Because of this ability to work together despite the obvious ideological differences, this has not stopped the Minor Northern Irish parties, The UUP and SDLP, pushing for the apparatus for an official opposition. The only theory I can think would the UUP and SDLP believed that the DUP and Sinn Fein would be so wholly opposed to the idea of being left together in Coalition that that would offer the UUP/SDLP some concessions but instead found the DUP/Sinn Fein not very bothered by the prospect of working together.
Should the apparatus be allowed for voluntary coalition in Northern Ireland a Sinn Fein/DUP coalition could form which would have majority, an idea however would be to further marginalise their opponents by bringing the Alliance party into coalition to take the Justice ministry which could also help to maintain harmony within the New government by removing a potential fight between the two larger parties.