Of course he won't, his online ramblings are part of his persona. If Donald Trump starts to behave like a respectable politician then he would be destroying the persona that took him to the WH. Being a loud, obnoxious manchild is what got him votes, the vague "tells it like it is" vibe is the only thing sustaining him as a political entity. There is nothing else to him, the man knows nothing about the world and has no positive human characteristics.