Board Thread:Warhammer 40k General Discussion/@comment-8570919-20130423231429/@comment-7186329-20130426154137

All species evolve constantly. Each generation is different, in the best scenario, stronger than the prevoius one. With those laws the possibility of  the Tau developing psychic powers cannot be dismissed.

The evolution and advancement of the Tau was because the Ethereals which mysterioulsy appeard, stopped the war the Tau waged on eachother and began promoting the idea of the Greater Good. Those that control the course of the Tau civilization are a mystery, they are not Tau and their goals are unknown. The Ethereals could be anything.

All humans possess a certain level of psychic influence, which is more prominent is some then others.

As for the Tau`s doom, the most probable way ,other than the bugs, to collapse their civilization is a civil war. The Kroot are suspect. Unlike the Tau, the Kroot are much more suseptible to the influence of Chaos.