Marxists usually apply a discourse regarding political economy because they perceive economy and ideology to be inseparable, and I'd expect Tito to also have done so. Yugoslavia as an entity was tightly coupled with the person of Tito and lacked mechanisms for keeping local governments in cooperation in his absence.

I'm sympathetic to the yugoslavian project and consider it an important source of inspiration and knowledge, but I don't believe fortune had anything to do with what happened afterwards.