FATEs is a system which is used and abused and we are starting to see the disadvantages of it to the point of, "why should I take part with so many lolplayers crowding my screen and not receive anything??".

Maybe over time, FATEs will become less popular while more content is introduced. FATEs like Odin and Bahamut will have competition from other NMs such as Fafnir and Aspid( the ground-kings of FFxi ). Other cameos like Garland (FF1) or Chaos would make a great FATE. Bringing back the NM wyrms like Tiamat and Vrtra. Another NM would be Cyberus which I speculate is going to be a FATE too.

If all the HNM FATEs become over-crowded, I don't know what other solution would be needed but to limit the system to the 'ol fashion claim-lock.