I thought it was obvious that I was talking about the earth from before they time traveled and after they came back (ie: centuries after the Great War, when the Maximals and Predacons ruled Cybertron. Also take note that I mentioned
Beast Machines as well, which should've been a big clue as to what I was referring to), but I guess it wasn't so obvious after all.
Well, I guess in the mind of someone who knows exactly what they're asking, it would be obvious. That said, you have to drop some clues as to what you're referring to.
You asked about the Earth from Beast Wars. That was a prehistoric Earth. We saw no futuristic Earth in Beast Wars. Thus, the Earth in Beast Wars was, again, a prehistoric Earth, the dawn of mankind. Now, had you asked about an Earth after the Great War, or the Earth at the time the Axalon and Darkside (I looked up Megatron's ship name, woot) went through the time slip, as opposed to the Earth
from Beast Wars, well, yes, I suppose that would have been more obvious. And mentioning Beast Machines doesn't technically assist your case, since Beast Machines was a continuation of Beast Wars, and since no Earth was shown, one would reference back to the Earth in Beast Wars.
That said, to your clarified question: who knows? We never got a glimpse at a futuristic Earth. Considering the Autobots won, and eventually went back to Cybertron, Earth probably came out just fine and went on living.