Your takeaway from that video is completely different than mine. If anything it shows me how incredibly rare and precious this moment in time is and how much had to happen before multi-cellular life could begin to evolve and how long after that it took to get to intelligent life.
That means that there may not be anything to 'come after us' depending how much of a mess we make, and any complacency regarding all this is dangerous. We stand to lose a lot, possibly everything and there may simply not be an 'after' for intelligent life on Earth. Life will go on, but not in a form that will ever even be able to contemplate colonizing Mars, let alone to act on it.
That means that there may not be anything to 'come after us' depending how much of a mess we make, and any complacency regarding all this is dangerous. We stand to lose a lot, possibly everything and there may simply not be an 'after' for intelligent life on Earth. Life will go on, but not in a form that will ever even be able to contemplate colonizing Mars, let alone to act on it.