Lesser explain how corruption helped SU survive longer, seems like a interesting idea please explain.
When laws are completely out of touch from reality, this is better or even necessary to broke these laws. For example if chief of the gulag has instruction from the party to produce some certain amount of goods. He is aware that if he would try to do it legally then this would be impossible. If he fails he would be fired from this job. So he do this illegally (buy necessary materials, transport etc). The outcome is that he managed and everybody are happy.
Ordinary workers to feed their families needed to steal from their factories what only possible. Otherwise they would die from hunger. Of course guards wanted bribes from the same reason. Bosses produced illegally additional goods for profit and consumers were happy that these goods are available on the black market.
First comment about economy being self destructing, its true but because of the military spending. look at Cuba same exact system as SU.
Every communist system is a bit different. I cannot judge Cuban, I'm not familiar with details. I doubt that they have as much bad system like Soviets. Cuban economy is not strong for sure.
not as good as market economies but good enough to survive.
Soviets could continue this as well. They simply decided to stop because it went in wrong direction. The Cubans otherwise. What particular moment
do you expect to announce collapse of the economic system
As far as county is concentrated, Cuba wont be territorially divided, because if I'm not wrong, people over there consider themselves to be Cubans. Soviet Union was federalist and ethnically divided.