The caveat being that's what should happen. Can't recall an active, (for a lack of a better word) ticker suddenly failing to file. Usually the tendency is one's with little interest fading off until they get suspended.
One of the more hilarious examples was with a ticker I was familiar with. After various shenanigans and failure to ever bring their reporting current, it went pretty much dormant. They finally suspended it. So what did they do? They filled a 15-12G to deregister and go dark ... after the fact.
The irony was back when it was getting some attention, they had filled to go dark and then pulled it in an attempt to make it appear they were going 'legit'.
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