@AshtonLaval There have been discussions about a Culture tribute anothology (with his literary estate). Problem is, living up to his standards is almost impossible for any other writer. Anyone good enough to do it is already ploughing their own field.
Your fantasy genre metaphor is this: there's no Brandon Sanderson waiting in the wings to pick up Iain's work and continue it. (And Iain died too suddenly to leave extensive notes for the rest of the series.)