Whilst I would welcome many more, I think that DAK is actually currently a 2 - 3 day park, IF you want to do every show, see all the animals, spend time wondering around, and riding the current attractions a few times (e.g. EE and Dinosaur - I could ride them all day!).
It does depend if you like the 'animal' side of it....I have stood watching the bats, hippo, tigers and gorillas for a long time! I find them fascinating.
I would however like 3 rides at Pandora...maybe they will add another when they can?