I think Trump saying he wants to make USA crypto Capital is referring to him being the first President of the United States and the world at large who publicly announce the legal use and acceptance of Bitcoin and crypto currency. As a public figure to the entire world, making this kind of statement is to announce to the world that USA is the first country that publicly by its President to accept the use of crypto currencies. This will increase the demand momentum of new investors and enthusiasts who will venture into the crypto community. Other countries will want to follow his footsteps and so on.
Bitcoin and crypto currencies are all made to be decentralized by nature, which has nothing to do with regulations. The government has always wanted to have control over everything. Here we are, knowing well that Trump is a crypto lover, but as a President he will bring up regulatory bodies in the community. Though, this will bridge the gap between the two sides, but they are of opposition to each other.