I dont think there will be another form of species that will evolve from us. I say this because I think the humans have always been the superior race on earth, as for other realms who knows. I can truly say that we only know what goes on here. For all we know there could be the "internet" some where else where aliens are and they can be living daily like us and all of that. So as for the earth I dont think we'll ever die out or have a species that isnt humans that takes over the earth.