I'm gonna be real with you mammals didn't even exist 250 million years ago. That's how much evolution has happened. In 250 million more, mammals will continue to evolve,
Not all dead but whoever remains will be very miserable. Most electronics won't last that long and requires complex production chains so no Mario Kart to spice up your hunter-gatherer lifestyle.
I mean, I can guarantee that every single mammal on earth alive today will be dead in 250 years. Nice prediction.
If you mean humanity: humans will 100% still be around in 250 years. Even with an advanced society. As advanced and interconnected as now? Who knows. But we'll still be far ahead of eg the middle ages or even early industrial revolution.
Continents rearrange themselves very slowly. The change will be gradual. There's no reason to think that life, including mammals, will not evolve during that time to cope with the change.
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