Board Thread:Warhammer 40k General Discussion/@comment-8570919-20130423231429/@comment-7232811-20130424185002

Back to the main topic, I bet the main thing that will spell the Tau's doom will be one of three things:

1: All their AI drones & tech will rebel against them, or go rogue, or become corrupted in some way.

2: When they first develop psykers, they'll be too inquisitive around them & protect them too  much, uncover too many things about the warp & end up with a daemon epidemic.

3: They will incorporate something into their empire that will destroy them from the inside out.