That's pretty ridiculous of them to say they have no plans to expand when they just had a world event with 5 dragons, added a new one to the spin wheel, and plan to release at least 2 more this week....not counting the new ones they released last week! Where do they expect people to put them??
I've already stopped breeding for things. I randomly selected a dragon from each side of the breeding screen by spinning the list and choosing whichever the 2 dragons on the bottom were. I just wanted some dynamite. I did get a dragon I didn't have (Healer) but all the others were things to hatch for event collections. I'm only at 98 habitats but they are all full and that's the max I can have at my level.
I hardly play this game anymore, I'm out of things to do. And no one who can do anything about it cares.