Watch Dogs, I think this title can sell as well as AC did. I dont see any of the online only games doing that great.

Of that list, Watch Dogs easily.

in the short term maybe yes. but in the long term i doubt it

How so? I mean, EA's been wanting a COD killer for YEARS. If this goes to PS4 and is as awesome as the dude bros say, viola.

Destiny, though it will be a let down gameplay wise.

watch dogs, titan fall, and destiny

I'd say Destiny or Watchdogs.

Hard to say, but from the ones listed in the OP, my personal favorite is Destiny. I love the class approach (the warlock seems like fun), and in general, I'm more interested in Destiny's setting than I am of Titanfall. I'm guessing Titanfall will beat out Destiny in popularity because it is closer to a traditional, multiplayer shooter, but I'm hoping Destiny gains a following.