The theory follows the trend of computer technology advancement. Following Moore's Law, within the next few decades we should have computers that could run a simulation of the entire universe, and with that possibility comes the probability that we will make such a simulation. Further on into the future and such computers will become cheaper, smaller, and more abundant. The prediction is that, following this and other trends such as population growth and civil advancement, by the year 2100 almost every person in our civilization will be running such a simulation on there own computer devices.
So, at this point, there will be billions of simulations being run of our universe...and only one actual universe. What are the odds that our universe is the real one? This is just the first part of the theory. In my following posts I will discuss various evidence we have found that suggests our universe could very well be a simulation.