I thought you just meant a convincing simulation. I didn't mean I thought we'd create the Matrix.
As for why I don't find it likely, there's no reason to assume it's the case. So it's unfalsifiable, big whoop. So are the other examples I listed, but you don't find them compelling. So, answer your own question: what's the difference?
The point is, if you believe it's likely, then it could be some way for you to answer a few mysteries of the universe. How did the big bang start the universe from a single point? Simple, it was the start of the simulation. Why is the speed of light the upper bound for velocity? Simple, it's the maximum value a variable type used in the programming, and to make it a higher value would use more memory. The probably aren't true, obviously, but it's just a way to wrap your mind around things you may never understand otherwise.
I'm an atheist myself, but only being able to resort to science when I want to have an answer for things is frustrating. I'm not saying I believe we are living in a simulation, but it is one of the many possibilities, and that gives me some peace of mind.