For the first time Irish nationalists have won more seats than Irish unionists. Conservatives are also moving away from UK-nationalism and towards English nationalism. And with a larger majority don't rely on unionists votes in the shortterm.
However, Sinn Feinn has seen a vote decline in favor of more moderate nationalists and cross-community parties. The Republic of Ireland also warned against a united Ireland because they're wary of opening a constitutional pandoras box. Levels of taxation and government services are very different between Northern Ireland and the Republic of Ireland.