I'm just writing what I felt after watching the movie.
To be honest, I would tell you this can be the end conclusion of the Matrix Trilogy. Simulation inside simulation, this is how the whole reality works. This is exactly what we are going to do in future. So we should doubt ourselves whether we are living in one of the Matrix simulations. An eye opener. When we die, we are going back to upper simulation. This is what our ancient scriptures was telling you since all these times.