He's got no reason to continue talking smack. He came in, did his job, and he hyped the fight. Conor's just trying to make a name for himself and he knows he's going to have to talk a big game (and also backing it up quite well).
Look at the guys he's fought: Brimage, Holloway, Brandao, Poirier, Siver. None of these guys really talk a big game at all and Conor has been trying to sell his fight and get people to tune in. Aldo isn't exactly Mr. Personality either, hell he passed on going into the cage after Conor's fight for a staredown