Yup. As much as the concept is neat, fundamentally it's the 7-player and runtime requirements that ruin it.
Games are allowed to have hurt feelings and flaws and brutality if they make up for it with something cool... But the severity of those flaws is amplified by run-time. An 8-hour game that is ruined by betrayal is monstrous.
Need a "diplomacy lite" that can be wrapped up in under 40 minutes