I'd add also an inherent necessity in Capitalism's stability is the marriage of concentrated riches with the state's power and its monopoly on violence. Should worker co-ops ever seriously threaten the wrong bourgeois lot, restrictive laws that only apply to the co-op will appear, unlawful actions will go ignored, state officials will be pressed to harass, legal means will be levied, etc, all until the co-op is tanked. 'Successful' worker co-ops are only ever permitted to the point where they don't meaningfully threaten any bourgeois power, profit is paid no heed in these situations.