Eh, it's typical retrofuturism type stuff, extending current technologies quantitatively rather than trying to predict categorical changes in available tech. A

Eh, it's typical retrofuturism type stuff, extending current technologies quantitatively rather than trying to predict categorical changes in available tech. Also the issues of dyson spheres aren't that bad. they could for instance channel the heat loss energy in a narrow beam out of the galactic plane so at least they'd be hard to spot by other galactic observers.