I don't know if everybody really died. The dyson sphere is so big and thick, it might have something to support life even they divide into pieces. If the dyson sphere where to collapse unto the planet, nobody is going to survive from that even the guy who they launched out of the dyson sphere.
I suspect what Toda destroyed where some kind of anchors keeping the dyson sphere from braking and drifting away from each other. It's a good decision of destroying those anchors, those high landers will definitely defile earth just to find some lost tech which I believe there no longer are.
Also, "part 01" !? So is there plans to continue the series or the world of the series?