Well, Torque have some solid 3D world and terrain editors with some cool things like roads, river tools.
It have grass management , a great lightmapper !

They can survive, if they decrease the price, and propose
a commercial version.

Another way, would be to develop a C# version.
Easy to use language with great free editors (like Mono).

They have a solid 3D engine, with great tools, and great multiplayer part also.

They can survive if they really put the hands on it and change
prices also !