1. It's a MMO. Last FFMMO was FF11, which, as I understand it, was a disappointment.
2. After FF13, and with Wii-KH3 rumors swirling, and with the PS3's third place standing firmly in place, I think that many people will be taking exclusivity with a grain of salt. Even if it doesn't change, by the time FF14 comes to a store shelf, we'll be into the next generation of systems, and no one will care about its impact on console sales.
3. Maybe they should focus more on releasing FF13 before hyping FF14.
FF11 is the most successful Final Fantasy game ever. Currently it should have atleast 500k people monthly subscribers.