The whole concept of a Dyson sphere is kinda idiotic. Any species that has Malthusians will never get to where it needs a Dyson sphere because their Malthusians lack vision and make up for that in hate. It's a safe bet that any species with IQ less than about 130 on a human scale will have a surfeit of Malthusians. Looking around HN, we have lots of Malthusians in our species.

EDIT: Inb4 the downvotes.