This donnybrook aint over
No, I don't suppose it is. My humble suggestion to some of the Cruz people several months ago was that they insert a line into the stump speech anchoring his story just a bit on his mother's side of the family. He talks a lot about his dad, who has a compelling flight to freedom and up from rags narrative, but on the birther thing, his mom's family is the key.
Three of Cruz's maternal great grandparents were immigrants from Ireland and Italy. The fourth, I think, was born in the U.S. I don't know how far back that family thread goes in the U.S. In a perfect world, Cruz would have a great uncle who was with the Irish Brigade at Fredericksburg, a great, great, great grandfather who froze at Valley Forge, and a bit of Native American heritage mixed in from an 18th century liaison that would make him as Indian as Elizabeth Warren. (He could just "recall" the latter without any corroboration at all, and still be as Indian as Elizabeth Warren.) I'm just making up those examples for fun. I don't know what the most compelling peg in his family tree might be. He could peg a story to a factory worker in Delaware or a farmer in Pennsylvania just as well. But it's important to make it a story, not a legal debating point.
None of that is relevant to the fact that he was born in Canada, but framing is important. People are thinking he's the son of a Cuban who was born in Canada, as opposed to the great great grandson of an iconic American type whose mother happened to be living in Canada when she gave birth.