Based on what metric? Kelly's backpedaling, or Trump's? perhaps the all of the private land that needs to be seized by the federal government using eminent domain? and the resulting court battles. Ask border texans what they think about that idea!
What makes you think that a "big, beautiful wall" is going to be built. What makes that "clear" to you? It must be all the members of congress lining up willing to fund such a boondoggle? You're in a fantasy land if you think that wall is going to be built. They'll build a 20 mile stretch for the photo op, and that will be good enough for the base.