Even if Titanfall was only on Xbox One I would still advise to just wait on it.
Microsoft loves to make cool looking system bundles (not all of them are great I'll admit ... COD MW3 dull grey 360 for example). Chances are there will be one for Halo 5 or some other game.
No console is worth owning for just one game ... maybe if your favorite game series of all time is exclusive to it or something, but nobody can say that of Titanfall since none of us have played it yet.
For example, I didn't just buy my PS4 to play a shiny next gen version of Battlefield 4 ... I got it for Infamous SS, Order and the dozens of indie games that interest me (Outlast, Octodad, The Witness, etc.). Also, it was a way for me to get more trophies since I like collecting them (same reason why the Vita was an easy purchase for me).
$560 just to play one game just seems wasteful to me.
