Recently, I had an argument with someone who stated that the chance of experiencing nothing after death is extremely low. Their reasoning was that one can think of many more metaphysical realities in which something else exists that would influence what we experience after death. So, if we look at the chances of nothing metaphysical existing compared to the chances of something metaphysical existing (which, at least for some of these possibilities, something is experienced after death), it seems extremely unlikely that nothing metaphysical exists, and also that nothing is experienced after death.
While it seems as if this argument is invalid, I have difficulty refuting it. What, if anything, is wrong with this argument?