Allow me to explain why it WOULD NOT!!!
The entire reason we knights came to Cradle was not to get a ton of energy, but to somehow save Isora in the (vaguely) described war. Thus, when we get the energy we still need to save Isora. 2: What if there isn't any energy directly in the core? What if the core is a doorway to another world, or another universe altogether, and a rift like that is eminating massive amounts of energy? If the core does have a ton of energy though, then as I stated we still need to save Isora. Spiral Knights would rise from the ashes like a majestic pheonix, rocketing up in an ocean of fire. It would be able to become slightly darker, more serious. Totally new weapons, armor, mechanics, enemies. It would be a refresh/reboot, and I think the community would love it.
Now it's your turn. Agree with me, or convince me otherwise.
(Good luck with that last bit.)
But the knights would just take out the power from the core, even if it's just a doorway to another universe.