The fact that he didn't choose this path either shows that he's incapable of strategic thinking and planning (a fatal flaw in any potential president) or perhaps he really does know that the questions of his constitutional eligibility for the office are more than just campaign rhetoric. In either case they don't bode well for any sort of national political future for him.
Cruz filled out the checklist better than anyone else running, as far as apparent conservatism. But, seeing the man in action on the campaign trail was not flattering to him at all. He’s going to have a lot to overcome, if he continues to have Presidential aspirations.
While I'm fairly sure that part of the deal he made with the GOP to keep running was that they would not fund a primary candidate against him...I'm even more certain he will not be reelected to the US Senate.
If there is not a grassroots challenger in the primary (look for a very rich man), there will be a "moderate" democrat that cleans his clock in the general.
"Ted Cruz was a Canadian Citizen when he asked for our vote 6 years ago. He deceived us by not disclosing that fact, one which he most certainly was aware".