"A good commander first seeks to put himself beyond the possibility of defeat, then waits for his opponent to make a mistake." -Sun Tzu, Thae Art of War. (Paraphrase)
Kind of what I see in the Tau. Expand, push into new resources, back away from threats. Then wait for an oppurtunity. They enjoy a unified interstellar empire, not just connected empire. They are technologists, and have already paralleled most other races in technology, so future advances put them a cut above. And lack of psyker powers is their number one asset. They might need it to defeat necrons like everyone suggests, until they get good enough at tech to literally 'dismantle' if you will the Grand Toaster Army. They'll be fine, unless their unity continues to degrade like it has with the farsight enclaves.
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