"Now that we know that DUMBs (not all) are being taken out, could this be it?"

But we don't "know" this. Lots of people with highly questionable character have asserted this, but we definitely do not "know" this is the case.

It's an interesting theory to posit and these booms are still happening, just not quite as frequently. But I've followed this phenomenon very closely, and there's no definitive explanation for them at this point.

The phenomenon is highly disturbing though.