That being said, the dissolution of the USSR was first and foremost a political crisis over the governing structure and only secondarily a social and economic collapse
Substantially agreed, though not entirely. If the actually existing Soviet system had been capable of sustained economic growth and continuing notable improvements in living standards, that would have gone a long way towards providing legitimacy to the political system.
A Soviet Union that was dynamic and successful would be a system that would work, plausibly only needing tweaks. The actual situation, where the Soviet Union proved itself increasingly incapable of its promises of even growing material prosperity, cut deeply.