Sammy Wilson quitting Stormont - what does that say about the Assembly's future?

So the DUP's Sammy Wilson is quitting the Assembly. He's one of the last double-jobbers, and he had to choose between Stormont and Westminster. He's opted to remain an MP, and stand down as an MLA. So what does his decision say about the DUP and the Assembly?

Liam Clarke is the political editor of the Belfast Telegraph