Maybe you are right but to show this to the world it would be much better to offer a demo of a bigger world to potential customers just to prove that it can be done. Show the world that you can make huge interiors with BSP and shaders applied! Show them some terrains with tons of instances of animated grass, trees, rocks and normal mapping on terrain, show them how good the realtime shadow cast animated foliage to the ground!

It is very important to convince potential customers that way.

Probably it is not that easy like in theory. I remember that there was a video of a pacific coast demo of the Torque engine around for years but they never released it, they released a rather small hall and an empty terrain as demos in the end.