Airlines lost interest in the -100 when the -200LR met the same performance estimates as the proposed -100 but with more passenger/payload carrying capablilty.
Makes you wonder though, if the -100(LR) airframe was produced, it would probably be able to fly half way around the world non-stop. Might have made a good presidential aircraft for some nations. I'm guessing that it would have been to heavy for a domestic version.
I'm not a real aeronautical engineer, I just play one on Airliners.net.