I think you've been watching the Matrix a bit too much.
nothing to do with Matrix, he has been reading what has been echoed thru centuries by all spiritual teachers, there is only one reallity and it aint this one we are living in :P heh
If it only exists in our mind (which I don't think is the case), then it still exists,
Actually if this picture is correct, picture of the universe, which looks like neuron network:
then we are all imagination in the mind of God, how about that? You are not really real, you are imagination and you can puff dissappear in a second which you will do, cos like here on earth is less then a second when you take into account the wast scale of the universe and the time by which universe goes ;)
how bout it? still sounds like matrix to you :D