I think you missed the point that life doesn’t have the luxury of time that we’ve had, because the sun is going to cook the planet in half the time as between us and the GOE. Our successors will have to advance farther, faster, and with fewer resources to escape the planet - which we still haven’t, in any meaningful way - before the sun makes the panet uninhabitable.
If humans somehow survive in some form and we can cut out most of the evolving-to-big-brains time, most of the knowledge they might inherit will be useless, as it’s based on resources they have no access to.
Sure, it isn’t impossible, but the odds are stacked against anyone following us succeeding in escaping a planet which is 2/3 of the way through its goldilocks phase of life. The best chance is for us to get our shit together, and get some self-sustaining colonies out there. Preferrably in deep space, eventually.