Imagine: Trash airships that can deposit loads at flying solar furnace platforms (equipped with co2 capture technology) to burn everything. Use various stages of processing to chemically or physically extract commercially valuable material, like phosphorous, then turn the rest into slag - not perfect, but one helluva lot better than burying and wasting the raw trash. Use the captured co2 and solar power alongside the artificial leaf tech to produce synthgas and other fuel.

Solar and wind platforms could anchored to cables on the ground, with municipal battery storage on the ground, then use airships to swap charged battery packs from centralized power stations.

A cellular/modular approach to ship design could prevent hindenburg disasters. Individual carbon fiber balloons could be made to link together, and they'd be during enough that even if you detonate a cell, its neighbors remain intact. Cells as small as a cubic meter would still provide lift while limiting the explosive potential - make the cells "smart" and you could design resilient airships that failed gracefully, even under fire, for military and security sensitive applications.

Platforms could be made huge, big enough to build houses, factories, hospitals, or resorts.

Airships don't have to be blimps. It's more practical than seasteading and probably multiple orders of magnitude cheaper in combined maintenance and development.