The future in which the terminator exists is an inherently capitalist future - that is, in the Promethean pursuit of profit above all else, human beings innovate A.I. systems beyond our control. As it is, the film (Terminator 1) already has an indirect anti-capitalist (or at least anti-Promethean). But what if the film was, as you say, communist in nature? First of all, the aesthetics would change. The glib 80s techno-style combined with the hyper violence would be replaced with a more down-to-earth and realistic portrayal. But what would change thematically? I suggest that the Terminator, instead of representing a force of inexorable death that preys off of 80s nuclear paranoia, would instead represent the immortality of capitalism (or as we know today as 'Capitalist Realism'). The T-800 would embody the results of a failed communist society - where the stage of capitalism was never outgrown and instead prolonged into worldly oblivion. I think in this version, Connor's savior, Kyle, would never come - instead, in true Leninist fashion - Connor would destroy the Terminator and secure the future of the revolution herself.