It will be much harder if it's not us. We've taken a lot of the easy resources, and many of them won't come back before the sun eats the Earth. (Some will, many won't.) Hard to build a technological civilization with no copper deposits left. It can (probably) be done, but it will be orders of magnitude slower.
For now. Personally, I hope that, if (and only if) we humans do destroy ourselves, enough life remains for something else to evolve and have a shot.