Furthermore, this kind of stuff always makes me wonder if/when other genus will eventually evolve into "intelligent" beings (with "intelligent" being loosely defined).

The Homo genus evolved around ~2-3 million years ago; homo sapiens came about ~250K years ago. What's not to say that 2 to 3 million years from now, there'll be some other intelligent species from other genus branches? It always tickles my brain to think about this.

Also relevant: https://io9.gizmodo.com/5780020/if-humanity-went-extinct-wha...