Stupid idea.
Way to offer constructive criticism...
Anyway, Ryan, it is possible from within the Blockland to make your own games. We have seen several comprehensive mods such as Rotondo's zombie mod which do contain new features for the user.
Cinematics is a tough one but might be possible using some kind of observer cam/bot hack. Would only be for the serious coder.
Many have at least started RPG mods (aloshi, bushi, rky, ecty) and most have some form of currency and use of items. Given more effort, some could become great games in their own right.
Platformers and FPSs are already possible using the minigame system and recently a 2D minigame add_on was released so you can make mario-like games.
Its all a matter of creativity and talent.