Future humans will have genetic engineering and computer augmentation, at the very least. They will (correctly) view all previous generations of human as comparatively primitive. That won't invalidate what they did.
My thinking is that:
1. Some humans make large contributions to humanity's progress.
2. Almost everyone makes some contribution.
3. A few unlucky people contribute nothing at all.
4. We should count ourselves lucky if we can contribute something.
5. There's no reason to spend a lot of comparing contributions, except insofar as it helps people contribute more in a healthy and productive way.
6. We should all contribute as much we can figure out how to, as one part of living a full and happy life.