Provide a detailed theoretical analysis of Nick Bostrom's Simulation Argument. Specifically, break down the trilemma: (1) The fraction of human-level civilizations that reach a post-human stage is close to zero, (2) The fraction of post-human civilizations interested in running ancestor-simulations is close to zero, or (3) The fraction of all observers living in a simulation is close to one. Discuss the implications of each proposition being true and evaluate the counter-arguments regarding the computational feasibility of simulating consciousness.