He obviously means "capacity to do good" as in capacity to keep a high-tech society running, and continue making technological improvements. He cares both about the cream of the crop for the next generation of cancer drugs (or computers), and the solid middle for being able to run modern accounting, retail supply chains, large-scale farming.

Obviously "doing good" often means other things too, like calling your mom, and volunteering at a soup kitchen. Morally good. I think it's pretty clear from context that this isn't what he's talking about.