I like most of the ideas posted so far. It seems that the two most liked ideas (by a huge margin) are colonization and science fiction sized space travel. Clearly the game has its limitations as of right now. Without an economy written into the game, adding one is a matter of ground-up design on a whole new aspect and likewise a whole bunch of man hours. Creating travel systems which are capable of light-year scale distances which are both practical and behave within the realism of the current game is nigh impossible. Still, the ideas are both important, because a game can't survive without a meaningful endgame. World of Warcraft, for example, desperately throws new content into the game because otherwise they have no endgame (unless you enjoy its mechanics). In a loot-chase kind of game, a player won't stick around after acquiring all the loot. KSP is far from World of Warcraft in concept, but if the game is about "discovering all the tech!" (*cough* loot chase *cough!*), then players will move on shortly after they do. Simulators are awesome, but their demographic is relatively small. Sure, they have their fans, but their numbers are meager compared to popular games and SQUAD has indicated that this is a game before a simulator. Missions can easily be added but in a way that just makes KSP a simulator with a prompt. It's a good idea on paper, but ultimately players may catch on to the fact that there isn't more to do, they are only being asked to do specific, existing things. Everyone is right to say that idea X is a lot of work, and idea Y changes the game, but I have seen fads come and go and I know that they all look very promising in the beginning. What makes them fads is that they don't have a permanent value to survive on after their players have experienced the whole of the game, or they put themselves in a positions to be trumped by a bigger and better version of themselves. I don't want to see KSP die for a lack of endgame or for the invention of a more potent parallel game. In my personal opinion and in regards to recent opinions posted, the game would benefit greatly from a paid add-on. Interstellar space travel via worm holes with procedurally generated solar systems is a LONG shot from the current mechanics of the game. Accelerating to twice the speed of light is fine and dandy (just add a big space motor), but the mechanics of the game are going to make slowing to a stop and landing anywhere a real improbability. At a survivable G-force, slowing from 600,000,000Km/s is ludicrous. Adding some kind of feature to make it less ludicrous is betraying the nature of the game by adding sci-fi magic. However, something like an add-on with wormholes is much more reasonable, mostly because there's no need to explain it or betray the realistic systems of the game. Just say "it's a wormhole, you explain it" and add a loading screen. Colonization is a HUGE addition to the game. Planetary resources, colony structures, survival challenges, environment variables, etc. etc. etc., it's all a lot of work and almost a whole new game attached. So don't attach it, develop it separately and release it as an expansion. Clearly people want these ideas, obviously people will pay for these ideas, so I think they should definitely see the light. How to implement them is a challenge likely to be unmet in the current game, but ignoring their potential entirely I fear will doom this game.