Most people aren't going to spend $400 now and $500 a year later for something that's 95% the same device. If you know you want Titanfall (on a [next gen] console) and want something to play next gen games, might as well choose the Xbox One.
Personally I'm not getting an Xbox One until the cost of games I want is greater than the cost of the system, so about 7 more games or ~3 years, barring price drops.