The following is not a question: Can something come from nothing?

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Actually, again, it isn't. There is no evidence that "nothing" - depending on how we want to define that, can actually exist.

It's nonsensical to say that nothing would exist.

Further, as there's no such thing as nothing in our universe, of course there's no evidence regarding it - we can't study nothing. It's a philosophical issue.

According to Quantum Theory nothing (nothingness to be clear) is unstable. It's fully possible that true nothing cannot exist.

To my knowledge quantum theory addresses vacuums, which aren't nothingness. Nothing can't be unstable, as instability is a property or attribute, and something that has a property or attribute is, well, something.

This can run and run forever. Quantum Physics is moving on from vacuums in a big way. It appears that what the physicists are saying (not unanimously BTW) is that particles and sub-particles can suddenly burst out of nothing, as long as the net energy of what is produced is zero.

In terms of the formation of the universe this would require balanced production of matter and anti-matter in the early symmetrical universe. As the universe aged (post inflation) that symmetry was lost. This is slowly being confirmed by observation.

The latest confirmation (last week) that they have traced the gravitational wave from the inflation of the universe is now leading to confirmation of a multiverse (I haven't yet understood why).

It appears, therefore, that the "nothing" between universes is constantly creating them.

Its mind-boggling - but that's where we seem to be.

If all of the above is true then it can be said that "nothing" is unstable merely because that is the best way to describe the apparent impossibility of the state.