The results of a Sinn Fein win would be devastating. This article from the Belfast Telegraph sums up what might well happen if SF makes it –
Adams sees the financial crisis as a moment to bring the two Irelands together. By trying to fit the crisis to his agenda, he could lose the chance to make strides in Ireland’s Parliament, which he could do if he focused solely on the financial crisis. I guess leopards don’t change spots that easily, or even realise it’s best sometimes to disguise them for a while. In the comments, my question seems to be answered. SF will only make it to junior status in a coalition, at best. If they do better than that, things could get very ugly very quickly.