As soon as that technology level is reached, humanity need not to worry about restoring dead ecosystems, but about preventing total destruction of the existing ones, including Earth. Throwing space rocks will be trivial for any terrorist cell, so any fragile single points of failure will be demolished first (like this magnetic shield, or possible Earth solar shade(because carbon capture doesn't work so far)). Then orbital stations will go, then pressurized domes, then planet surfaces in general.
I think we have no chance at the large space structures, and current age will be considered a fluke of the insufficient lifting capabilities.
I think we have no chance at the large space structures, and current age will be considered a fluke of the insufficient lifting capabilities.