single word requests - more concise way to describe a system that is doomed to fail, inherently flawed, temporary/transient

I'm trying to describe, in one or two words, a system which is set up so that it cannot be long lasting; it is destined to collapse.

"Marx and Engels finish their overview of Marxist theory by arguing that the very nature of the bourgeoisie system makes it..."

I was going to use Sisyphean but that refers to a task that can never be finished rather than one that will end in disaster.

edit: currently using 'sisyphean and transient'

edit: the word doomed doesn't fit the sentence.

edit: to make it clear: im trying to find the word that best fits the sentence, im trying to convey the idea that the system cannot last, it is inherently self-destructive and will end sooner rather than later