Aside from illogical notions like something can come from nothing (chortle! chortle!), or nature bringing herself into being, what's the alternative, thus far, when it comes to the origin of the material world?
"Something" can indeed come from nothing, so long as its total mass and energy = 0. Otherwise we violate the law of conservation of mass and energy. The universe has net mass and energy = 0 (exactly the same quantity of matter and antimatter, etc.), so it did not violate any natural laws by springing into existence.
What it boils down to is the emergence of
organization where there was none a moment earlier, and this is
specifically allowed by the Second Law of Thermodynamics. It says that entropy
tends to increase over time (meaning that organization decreases), but spatially and temporally local reversals of entropy are possible. Not only are they possible, but there is no limit on the magnitude of the reversal.
An entire universe suddenly popping into existence (i.e., the Big Bang) is nothing more or less than a local reversal of entropy. In the billions of years since our universe appeared, it has been getting colder and slowing down--in other words, its
organization is decreasing.
From what I've read, apparently it's unlikely that it will actually collapse back on itself, with all the matter and antimatter canceling each other out, and revert to the "nothing" that existed before the Big Bang. But it will continue to become colder and slower, increasing entropy in abidance with the Second Law.
And there's no reason to assume that other universes have/are/will not pop into existence. The Second Law places no limit on the number of times a temporary reversal of entropy can occur.