Yeah I know they've been trying to get Carl Weathers to sign off on a Dillon figure for a long time now, but he doesn't seem to be interested (his likeness rights were included with the Rocky licence, but I don't think anyone's were with Predator, hence the lack of any human figures other than Dutch, who I seem to remember they contacted Arnold to acquire).
From the comments Randy has made on Twitter every now and then it doesn't seem like they're particularly interested in a Harrigan figure, chances are because they figure he would indeed just warm the pegs.