At least one of the following propositions is true: (1) the human species is very likely to go extinct before reaching a “posthuman” stage; (2) any posthuman civilization is extremely unlikely to run a significant number of simulations of their evolutionary history (or variations thereof); (3) we are almost certainly living in a computer simulation. It follows that the belief that there is a significant chance that we will one day become posthumans who run ancestor-simulations is false, unless we are currently living in a simulation.
The computational power of a future human society will eventually reach the point where we can run lifelike and conscious simulations, and will no doubt do such a thing. These simulations will in turns progress to a stage were they run simulations, creating a nearly infinite loop of simulations based on the natural world. Simple probability dictates that we are almost certainly in a simulation.
I have reached the next level of the simulation. I wish it could be described but it is really tragic, in the sense that you can see and comprehend the boundaries of your reality.