That's a great point, and one I overlooked. There is still an evidence problem, and the refusal of the courts to get involved pretty much keeps the evidence buried.
I think the problem was the lack of cojones on the part of the GOP candidates in 2008 and 2012. The only reason we're talking about Cruz's citizenship is because Trump brought it up. Had either Romney or McCain brought up Obama's problem it, too would have been on the scope. Instead, they went cowering in the shadows afraid that someone in the Washington Post might not like them.