This equivocation between consciousness and meta-consciousness is so widespread that a plethora of books, which are seemingly dedicated to the project of "explaining consciousness", instead spend their entire contents explaining some hypothesis involving meta-consciousness and then proceed to declare victory without ever touching consciousness itself. Jaynes' "The Origins of Consciousness in the Breakdown of the Bica…
Within the "metaconsiousness" definition provided int he article, I think it very likely that the distinction is more of an illusion than anything else.
attention is the key to distinguish between unconscious thought and conscious thought
Say we're learning to operate a car... You are very "aware" of steering and pedals and gears. After a while, you start just thinking in terms of forward, this way, stop, faster. The mechanics start to be handled "subconsiously"^ as you go along. Awareness/attention then gets drawn back if something goes wrong, say your gear sticks. A lot of learning seems to be like this. Aware & consious actions repeated until it becomes subconsious. I think this process is gradual. More importantly, the observable outputs are very hard to stack neatly into two piles.
On top of that we have the problem of fooling ourselves. If I asked you "why did you change lanes?" you will probably give me an answer, but a lot of expirements suggest that answer is made up after the fact.
I think it's more likely that metaconsiousness is made of the same stuff as subconsiousness. It's just the type of consiousness that we notice (tautology?) and consider to be us.
TLDR, I agree that the more important breakthroughs will probably be at the worm consiousness level, but that is itself a theory of consiousness.
^As mentioned below, it's a problem using, defining and speculating about these terms simultaneously. I'm doing it anyway, but yeah...