You can use the dyson structure for other things.. there is a (sci-fi'esque) suggestion called a Matrioska Brain I think, where the entire dyson structure is made of computational substrates - it could be conveniently powered by the solar radiation but also by fusion. Given the track of AI and realistic world sims, everything might end up "living" inside one of those structures..
You would have to protect it pretty decently though..