“The solar system will not be converted to a giant Matrioshka brain in the next 989 years.”

As humanity spreads throughout the solar system, it will discover that it is attached physically as well as emotionally not just to Earth but to every planet in the system. Humans will continue to perceive themselves as existing primarily physically (contrary to the future depicted by some writers about the "Singularity") and will therefore want planets to exist ON even if not all of them can be terraformed. Some happy medium will be found whereby it is not necessary for most humans to upload themselves into some universal machine consciousness and therefore there will be no need for a giant Matrioshka brain.