Wormhole technology needed negatron matter and a lot of energy.
The true world had the latter while the Panama Continent had the former.
Now, however, with the negatron mines and vents, the true world also got its hand on negatron matter. The Panama Continent, on the other hand, did not receive a lot of energy.
"We don't have a Dyson Sphere around the Sun. And even with Suneater returning to Gaia for unknown reasons, we will not be able to protect our Dyson Sphere from him, even if we try to take over the empty spot, which is why none of the other civilizations have tried claiming the empty space. We wouldn't be able to beat everybody to it, either. In other words…"
