@dharma bum,
The way I see it, if Nothing were a possible state for the universe then we wouldn't be here. Sooner or later, as it wanders around its possibility space, the universe would arrive at this location, and that would be the end of it. Having arrived it could never leave, the possibility space would collapse instantly.
It seems more likely that the original phenomenon from which we arise is not Nothing and is immutable. Unless this is the case then 'Nothingness' is a possible state of the universe and we shouldn't be here.
If this phenomenon is inconceivable, as Kant, Hegel, Bradley, Peirce and all the mystics conclude, then for the intellect it must be a conceptual Void, a psychological Abyss, but this would not be the opposite of Something nor the opposite of Nothing. We would arrive at this phenomenon by what Hegel calls the 'sublation' of the contradiction between Something and Nothing, for the original unity would transcend this distinction.
To the question of whether the universe originates in Something or Nothing the answer would be no, and this would be why the question is undecidable and drives us nuts in philosophy.