They have to open it eventually. Just because the Core opens doesn't mean it's the end of the game. There are other planets besides Cradle to explore. And we have to know if they eventually do get off Cradle at all, what happened to the Recon Team, etc, not to mention other big characters like King Tinkerzar.
The game can't remain on a cliffhanger forever. The mystery of the Core, the Recon Team, and if the Knights ever repair the Skylark and return home HAS to be answered eventually.
You realize that this is a mystery for the ages, right? That if they did open the core it'd be the end of days?
Thank you.