Nothing will be here in a billion years. Setting aside the fact that no species lasts that long anyway, Earth only has a few hundred million years of habitability left, if "nature" has its way. The sun's steadily brightening as it ages and tectonic processes are causing changes in Earth's atmosphere that will eventually prevent photosynthesis from operating, at which point Earth become the domain of a few hardy strains of bacteria again.

That is, unless humans (or our very distant descendants) decide to do some meddling to keep Earth alive. There's various ways to do that, from solar shields reducing the solar influx to moving Earth's orbit farther out to stripping material from the Sun itself to moderate its output.

"Gaia" has no foresight. She will sorely miss humanity's technological descendants once the planet gets in that situation, there's nothing she can do about it herself.

I'm saying even humans with the ability to make pottery were able to survive in niches that our pests can't even survive in, from the desert to the artic. We outcompete everything even without industrial technology and can survive on some pretty crazy diets. Invertebrate life could survive an extinction event that wipes us out, but I can't imagine any vertebrate doing so (including the ocean ones).

We were the one bipedal line out of 7 or more, that only almost died out. We are made to be more adaptable.

We won’t be here in another billion years.

I don't know about you, but I sure won't be