Personally, I don't like the trend of having a gazillion wonders in the game. At one point, they stop being wonders and become a "generic boost number 5." For me, Civ5 already crossed that line.
So my answer would actually be: I hope they remove some of the wonders or at least make it more difficult to build the existing ones so it really feels like an accomplishment to have built one.
I'm guessing Civ 6 on launch will be pretty stripped bare for Wonders. But they'll probably add more in the expansions.
I'm all for more wonders but I think they should be somewhat more situational too - so you shouldn't be able to get access to them in every game.
Maybe a wonder could require 5 golden ages or you need to conquer a civ first, i.e. Trajens column or coloseum of rome