My predictions are ATV4 will be just fine with the remote it have now. Most developers will find a solution to their games, and people will play Candy Crushed Rose Golds like the day will never fade. A few games will have an advanced mode, and maybe sell two or three copies because the controller they require are so rare, and there will probably be at least 30-40 different controllers on the market and for games supporting all of those... will never materialize (with or without Apples limitations). Why do I believe this? Look at the success for controllers not initially with the gaming devices, very few have support from a large number of games. Also if you look at the situation for OS X, there are support for different kind of controllers, but rarely are they properly implemented because they don't come standard with a Mac.