I think that there could be a bit of reverse psychology here, Disney-style. For instance, *before* Disney installed FastPass at Living with the Land, I hardly ever saw a line. After FastPass? Every time I was in The Land pavillion, there was always a line for that attraction...
Now, here's Disney, thinking that they'd like to boost Trails End's business. (I don't remember any Trip Reports or restaurant reviews mentioning long waits at TE...in fact, in the past hasn't it been a place where you could get a fairly quiet meal with no huge crowds?) *So* they add Trails End to the list of restaurants offering PSs, indicating that there is a demand for Priority Seatings at that restaurant... and voila!, a self-fulfilling prophecy.
agnes!