Yeah, I think the 650GS was too good, in a way. So they cancelled it, and focused on marketing those over-engineered half-ton things that people get regularly stuck on, anywhere off-road.
The BMW G650GS was the best bike I've had. Almost zero maintenance. Reliable. Amazing fuel economy. Decent on road when sat down. No probs doing 600km days. Decent off-when road standing up. It could handle deep sand when fitted with good tires. Not very sexy looking, but the perfect jack of all trades. And, yes, master of none - which is why BMW could not market it much further, I think. Pity.