He spent an exorbitant amount of energy * effort to win Iowa.
Like Huckabee and Santorum, before Cruz, all three candidates came out of Iowa with a win but no strong foundation in the upcoming states.
Their formibility dwindled and they were washed away rather quickly.
I don't see that happening with Trump.. especially in the bigger electoral states.
Trump did just fine in Iowa and going into New Hampshire has the edge by comparison.
You really need to do more research before commenting. There have been many articles talking about the level of Cruz's infrastructure in the upcoming states. He even has a strong organization in California, which is the last primary of the season. Of all of the candidates, Cruz is the one who has spent the most time and effort laying the foundation for a strong GOTV in all of the primary states at least through March 15th.