We started with two main unionist party’s. One was moderate and one was hard-line. The hard-line DUP has become more moderate and pushed the UUP out. The TUV tried to claim the ground the DUP used to have but have proven unsuccessful.
So it looks like we are on our way to having one main Unionist party. It’s good in the fact that the Unionists are becoming more moderate and hopefully with one Unionist part there will be more power sharing. This can’t happen at the minute because if one Unionist party seems to be siding with Nationalists they are afraid they will loose voters to the other party.
I can’t start posts yet but perhaps you should start one and ask the same questions about Nationalist party's.