My judgment as of today says barring new information, this damages Cruz. Trump goes on to win the nomination.
My guess is that Trump foregoes selecting Cruz for his running mate, opting instead for a more moderate choice.
In part this illustrates the political axiom "what goes around, often comes around."
Yesterday it was published that 26% identified as Republicans. Cruz has reached around 25% of those, or 6-7% max. of our population is supporting him personally.
He is a fine, great, wonderful human being. But he can claim he is a NBC till the cows come home, but it takes more than his word alone.
Calling your boss a liar is not a preferred tactic in most areas of endeavor, least of all politics.
So where we sit as of now, Cruz has very loud, very deep support of but a narrow segment of our country, and no more.