I would say the problem is very simple.
There are a lot of good artists who could write a game, but there aren't enough game examples which they could copy and use as base for their game.
It's not the problem that starting a game from scratch is too much work with Leadwerks Engine, but the problem is the lack of examples how to do things.
So my suggestion is to publish a series of simple games for every game genre: FPS, TPS, RTS, RPG, Adventure, Car Racing, Platform Jumping, Sidescroller, Arcade, MMO.
They should available for all registered users with full source code and zlib license so that they can freely use the source in their own games.