I guess I would answer your statement with the following (found throughout the book): Is Nothing simple? Would ours be a simpler universe if nothing existed? Then why doesn't the Law of Parsimony (alias Occam's Razor) dictate that a Nothing be in our place instead of our something?
Thermodynamic argument against Nothing (and, for that matter, the production of Something from Nothing): the entropy state for Nothing is infinite. (Specifically, negative infinity. It's based on the logarithm - in this situation, it doesn't matter what base you use, though 2 is traditional - of the number of possible states that are identical to the current state based on macroscopic properties, or of the number of bits of information needed to describe the system.)
Clearly, an infinity is a more complicated state than any other number, because you can produce any real number out of it without changing it. (That is, the solutions of "-infinity + x = -infinity" are... well, all real values of x.) Since x in the parenthetically-noted equation corresponds to the entropy of any given subset of existence, it therefore becomes possible to produce Something (an object with 2^x states) from Nothing (an object with 0 states).
The next step is determining what the simplest state is, and proving it, which will be left as an exercise for the reader. (I suspect that the simplest state is "an infinite number of objects at maximum entropy, such that the distribution of object sizes is itself at a state of maximum entropy" - but proving that is liable to be an absolute mess at best. The net result is an infinite multiverse where the component universes are of varying properties, including at least one flat universe with an infinite number of dimensions.)