Trump has now gone as far as he can go without having to express exactly what he would do. The time is quickly approaching when, if Trump wants to maintain his support, he’ll have to actually enlighten us as to what President Trump’s America would look like, beyond magnificent golf courses and top-flight hotels.
I don't think this is true at all. If anything, Trump just needs to keep being provocative and attacking the rest of the field as incompetent politicians. There is enough anger and disenchantment out there that it may not matter what the specifics of his plans are. So long as he is vague, people can project onto him their own ideology.