He needs to sit one day.. stop sucking all the air away from the candidates who have worked so hard. JUST WAIT
Trump has also worked very hard to elect conservative and populist Republicans. He's stumped all over the country appearing at rallies for candidates. Most of them owe him their primary wins and, if they win tomorrow, they'll owe a good chunk of the victory to Trump.
That said, I think he should not announce until early next year. Most people will want a breather from politics at least during the holiday season. I don't know what his rush is.